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Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
[mirror_ubuntu-disco-kernel.git] / drivers / net / wireless / intel / iwlwifi / mvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 *
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
21 *
22 * Contact Information:
23 * Intel Linux Wireless <linuxwifi@intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *
26 *****************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37 #include "rs.h"
38 #include "fw-api.h"
39 #include "sta.h"
40 #include "iwl-op-mode.h"
41 #include "mvm.h"
42 #include "debugfs.h"
43
44 #define RS_NAME "iwl-mvm-rs"
45
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47
48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
50 */
51 #define RS_PERCENT(x) (128 * x)
52
53 static u8 rs_ht_to_legacy[] = {
54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 [ANT_NONE] = ANT_NONE,
68 [ANT_A] = ANT_B,
69 [ANT_B] = ANT_C,
70 [ANT_AB] = ANT_BC,
71 [ANT_C] = ANT_A,
72 [ANT_AC] = ANT_AB,
73 [ANT_BC] = ANT_AC,
74 [ANT_ABC] = ANT_ABC,
75 };
76
77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
84 IWL_RATE_##rn##M_INDEX }
85
86 #define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
93 IWL_RATE_INVM_INDEX }
94
95 /*
96 * Parameter order:
97 * rate, ht rate, prev rate, next rate
98 *
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
101 *
102 */
103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
119 };
120
121 enum rs_action {
122 RS_ACTION_STAY = 0,
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
125 };
126
127 enum rs_column_mode {
128 RS_INVALID = 0,
129 RS_LEGACY,
130 RS_SISO,
131 RS_MIMO2,
132 };
133
134 #define MAX_NEXT_COLUMNS 7
135 #define MAX_COLUMN_CHECKS 3
136
137 struct rs_tx_column;
138
139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
140 struct ieee80211_sta *sta,
141 struct rs_rate *rate,
142 const struct rs_tx_column *next_col);
143
144 struct rs_tx_column {
145 enum rs_column_mode mode;
146 u8 ant;
147 bool sgi;
148 enum rs_column next_columns[MAX_NEXT_COLUMNS];
149 allow_column_func_t checks[MAX_COLUMN_CHECKS];
150 };
151
152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
153 struct rs_rate *rate,
154 const struct rs_tx_column *next_col)
155 {
156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
157 }
158
159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
160 struct rs_rate *rate,
161 const struct rs_tx_column *next_col)
162 {
163 struct iwl_mvm_sta *mvmsta;
164 struct iwl_mvm_vif *mvmvif;
165
166 if (!sta->ht_cap.ht_supported)
167 return false;
168
169 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
170 return false;
171
172 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
173 return false;
174
175 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
176 return false;
177
178 mvmsta = iwl_mvm_sta_from_mac80211(sta);
179 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
180
181 if (mvm->nvm_data->sku_cap_mimo_disabled)
182 return false;
183
184 return true;
185 }
186
187 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
188 struct rs_rate *rate,
189 const struct rs_tx_column *next_col)
190 {
191 if (!sta->ht_cap.ht_supported)
192 return false;
193
194 return true;
195 }
196
197 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
198 struct rs_rate *rate,
199 const struct rs_tx_column *next_col)
200 {
201 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
202 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
203
204 if (is_ht20(rate) && (ht_cap->cap &
205 IEEE80211_HT_CAP_SGI_20))
206 return true;
207 if (is_ht40(rate) && (ht_cap->cap &
208 IEEE80211_HT_CAP_SGI_40))
209 return true;
210 if (is_ht80(rate) && (vht_cap->cap &
211 IEEE80211_VHT_CAP_SHORT_GI_80))
212 return true;
213
214 return false;
215 }
216
217 static const struct rs_tx_column rs_tx_columns[] = {
218 [RS_COLUMN_LEGACY_ANT_A] = {
219 .mode = RS_LEGACY,
220 .ant = ANT_A,
221 .next_columns = {
222 RS_COLUMN_LEGACY_ANT_B,
223 RS_COLUMN_SISO_ANT_A,
224 RS_COLUMN_MIMO2,
225 RS_COLUMN_INVALID,
226 RS_COLUMN_INVALID,
227 RS_COLUMN_INVALID,
228 RS_COLUMN_INVALID,
229 },
230 .checks = {
231 rs_ant_allow,
232 },
233 },
234 [RS_COLUMN_LEGACY_ANT_B] = {
235 .mode = RS_LEGACY,
236 .ant = ANT_B,
237 .next_columns = {
238 RS_COLUMN_LEGACY_ANT_A,
239 RS_COLUMN_SISO_ANT_B,
240 RS_COLUMN_MIMO2,
241 RS_COLUMN_INVALID,
242 RS_COLUMN_INVALID,
243 RS_COLUMN_INVALID,
244 RS_COLUMN_INVALID,
245 },
246 .checks = {
247 rs_ant_allow,
248 },
249 },
250 [RS_COLUMN_SISO_ANT_A] = {
251 .mode = RS_SISO,
252 .ant = ANT_A,
253 .next_columns = {
254 RS_COLUMN_SISO_ANT_B,
255 RS_COLUMN_MIMO2,
256 RS_COLUMN_SISO_ANT_A_SGI,
257 RS_COLUMN_LEGACY_ANT_A,
258 RS_COLUMN_LEGACY_ANT_B,
259 RS_COLUMN_INVALID,
260 RS_COLUMN_INVALID,
261 },
262 .checks = {
263 rs_siso_allow,
264 rs_ant_allow,
265 },
266 },
267 [RS_COLUMN_SISO_ANT_B] = {
268 .mode = RS_SISO,
269 .ant = ANT_B,
270 .next_columns = {
271 RS_COLUMN_SISO_ANT_A,
272 RS_COLUMN_MIMO2,
273 RS_COLUMN_SISO_ANT_B_SGI,
274 RS_COLUMN_LEGACY_ANT_A,
275 RS_COLUMN_LEGACY_ANT_B,
276 RS_COLUMN_INVALID,
277 RS_COLUMN_INVALID,
278 },
279 .checks = {
280 rs_siso_allow,
281 rs_ant_allow,
282 },
283 },
284 [RS_COLUMN_SISO_ANT_A_SGI] = {
285 .mode = RS_SISO,
286 .ant = ANT_A,
287 .sgi = true,
288 .next_columns = {
289 RS_COLUMN_SISO_ANT_B_SGI,
290 RS_COLUMN_MIMO2_SGI,
291 RS_COLUMN_SISO_ANT_A,
292 RS_COLUMN_LEGACY_ANT_A,
293 RS_COLUMN_LEGACY_ANT_B,
294 RS_COLUMN_INVALID,
295 RS_COLUMN_INVALID,
296 },
297 .checks = {
298 rs_siso_allow,
299 rs_ant_allow,
300 rs_sgi_allow,
301 },
302 },
303 [RS_COLUMN_SISO_ANT_B_SGI] = {
304 .mode = RS_SISO,
305 .ant = ANT_B,
306 .sgi = true,
307 .next_columns = {
308 RS_COLUMN_SISO_ANT_A_SGI,
309 RS_COLUMN_MIMO2_SGI,
310 RS_COLUMN_SISO_ANT_B,
311 RS_COLUMN_LEGACY_ANT_A,
312 RS_COLUMN_LEGACY_ANT_B,
313 RS_COLUMN_INVALID,
314 RS_COLUMN_INVALID,
315 },
316 .checks = {
317 rs_siso_allow,
318 rs_ant_allow,
319 rs_sgi_allow,
320 },
321 },
322 [RS_COLUMN_MIMO2] = {
323 .mode = RS_MIMO2,
324 .ant = ANT_AB,
325 .next_columns = {
326 RS_COLUMN_SISO_ANT_A,
327 RS_COLUMN_MIMO2_SGI,
328 RS_COLUMN_LEGACY_ANT_A,
329 RS_COLUMN_LEGACY_ANT_B,
330 RS_COLUMN_INVALID,
331 RS_COLUMN_INVALID,
332 RS_COLUMN_INVALID,
333 },
334 .checks = {
335 rs_mimo_allow,
336 },
337 },
338 [RS_COLUMN_MIMO2_SGI] = {
339 .mode = RS_MIMO2,
340 .ant = ANT_AB,
341 .sgi = true,
342 .next_columns = {
343 RS_COLUMN_SISO_ANT_A_SGI,
344 RS_COLUMN_MIMO2,
345 RS_COLUMN_LEGACY_ANT_A,
346 RS_COLUMN_LEGACY_ANT_B,
347 RS_COLUMN_INVALID,
348 RS_COLUMN_INVALID,
349 RS_COLUMN_INVALID,
350 },
351 .checks = {
352 rs_mimo_allow,
353 rs_sgi_allow,
354 },
355 },
356 };
357
358 static inline u8 rs_extract_rate(u32 rate_n_flags)
359 {
360 /* also works for HT because bits 7:6 are zero there */
361 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
362 }
363
364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
365 {
366 int idx = 0;
367
368 if (rate_n_flags & RATE_MCS_HT_MSK) {
369 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
370 idx += IWL_RATE_MCS_0_INDEX;
371
372 /* skip 9M not supported in HT*/
373 if (idx >= IWL_RATE_9M_INDEX)
374 idx += 1;
375 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
376 return idx;
377 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
378 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
379 idx += IWL_RATE_MCS_0_INDEX;
380
381 /* skip 9M not supported in VHT*/
382 if (idx >= IWL_RATE_9M_INDEX)
383 idx++;
384 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
385 return idx;
386 } else {
387 /* legacy rate format, search for match in table */
388
389 u8 legacy_rate = rs_extract_rate(rate_n_flags);
390 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
391 if (iwl_rates[idx].plcp == legacy_rate)
392 return idx;
393 }
394
395 return IWL_RATE_INVALID;
396 }
397
398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
399 struct ieee80211_sta *sta,
400 struct iwl_lq_sta *lq_sta,
401 int tid);
402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
403 struct ieee80211_sta *sta,
404 struct iwl_lq_sta *lq_sta,
405 const struct rs_rate *initial_rate);
406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
407
408 /**
409 * The following tables contain the expected throughput metrics for all rates
410 *
411 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
412 *
413 * where invalid entries are zeros.
414 *
415 * CCK rates are only valid in legacy table and will only be used in G
416 * (2.4 GHz) band.
417 */
418
419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
420 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
421 };
422
423 /* Expected TpT tables. 4 indexes:
424 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
425 */
426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
427 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
428 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
429 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
430 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
431 };
432
433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
434 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
435 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
436 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
437 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
438 };
439
440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
441 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
442 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
443 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
444 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
445 };
446
447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
452 };
453
454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
459 };
460
461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
466 };
467
468 /* mbps, mcs */
469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
470 { "1", "BPSK DSSS"},
471 { "2", "QPSK DSSS"},
472 {"5.5", "BPSK CCK"},
473 { "11", "QPSK CCK"},
474 { "6", "BPSK 1/2"},
475 { "9", "BPSK 1/2"},
476 { "12", "QPSK 1/2"},
477 { "18", "QPSK 3/4"},
478 { "24", "16QAM 1/2"},
479 { "36", "16QAM 3/4"},
480 { "48", "64QAM 2/3"},
481 { "54", "64QAM 3/4"},
482 { "60", "64QAM 5/6"},
483 };
484
485 #define MCS_INDEX_PER_STREAM (8)
486
487 static const char *rs_pretty_ant(u8 ant)
488 {
489 static const char * const ant_name[] = {
490 [ANT_NONE] = "None",
491 [ANT_A] = "A",
492 [ANT_B] = "B",
493 [ANT_AB] = "AB",
494 [ANT_C] = "C",
495 [ANT_AC] = "AC",
496 [ANT_BC] = "BC",
497 [ANT_ABC] = "ABC",
498 };
499
500 if (ant > ANT_ABC)
501 return "UNKNOWN";
502
503 return ant_name[ant];
504 }
505
506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
507 {
508 static const char * const lq_types[] = {
509 [LQ_NONE] = "NONE",
510 [LQ_LEGACY_A] = "LEGACY_A",
511 [LQ_LEGACY_G] = "LEGACY_G",
512 [LQ_HT_SISO] = "HT SISO",
513 [LQ_HT_MIMO2] = "HT MIMO",
514 [LQ_VHT_SISO] = "VHT SISO",
515 [LQ_VHT_MIMO2] = "VHT MIMO",
516 };
517
518 if (type < LQ_NONE || type >= LQ_MAX)
519 return "UNKNOWN";
520
521 return lq_types[type];
522 }
523
524 static char *rs_pretty_rate(const struct rs_rate *rate)
525 {
526 static char buf[40];
527 static const char * const legacy_rates[] = {
528 [IWL_RATE_1M_INDEX] = "1M",
529 [IWL_RATE_2M_INDEX] = "2M",
530 [IWL_RATE_5M_INDEX] = "5.5M",
531 [IWL_RATE_11M_INDEX] = "11M",
532 [IWL_RATE_6M_INDEX] = "6M",
533 [IWL_RATE_9M_INDEX] = "9M",
534 [IWL_RATE_12M_INDEX] = "12M",
535 [IWL_RATE_18M_INDEX] = "18M",
536 [IWL_RATE_24M_INDEX] = "24M",
537 [IWL_RATE_36M_INDEX] = "36M",
538 [IWL_RATE_48M_INDEX] = "48M",
539 [IWL_RATE_54M_INDEX] = "54M",
540 };
541 static const char *const ht_vht_rates[] = {
542 [IWL_RATE_MCS_0_INDEX] = "MCS0",
543 [IWL_RATE_MCS_1_INDEX] = "MCS1",
544 [IWL_RATE_MCS_2_INDEX] = "MCS2",
545 [IWL_RATE_MCS_3_INDEX] = "MCS3",
546 [IWL_RATE_MCS_4_INDEX] = "MCS4",
547 [IWL_RATE_MCS_5_INDEX] = "MCS5",
548 [IWL_RATE_MCS_6_INDEX] = "MCS6",
549 [IWL_RATE_MCS_7_INDEX] = "MCS7",
550 [IWL_RATE_MCS_8_INDEX] = "MCS8",
551 [IWL_RATE_MCS_9_INDEX] = "MCS9",
552 };
553 const char *rate_str;
554
555 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
556 rate_str = legacy_rates[rate->index];
557 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
558 (rate->index <= IWL_RATE_MCS_9_INDEX))
559 rate_str = ht_vht_rates[rate->index];
560 else
561 rate_str = "BAD_RATE";
562
563 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
564 rs_pretty_ant(rate->ant), rate_str);
565 return buf;
566 }
567
568 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
569 const char *prefix)
570 {
571 IWL_DEBUG_RATE(mvm,
572 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
573 prefix, rs_pretty_rate(rate), rate->bw,
574 rate->sgi, rate->ldpc, rate->stbc);
575 }
576
577 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
578 {
579 window->data = 0;
580 window->success_counter = 0;
581 window->success_ratio = IWL_INVALID_VALUE;
582 window->counter = 0;
583 window->average_tpt = IWL_INVALID_VALUE;
584 }
585
586 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
587 struct iwl_scale_tbl_info *tbl)
588 {
589 int i;
590
591 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
592 for (i = 0; i < IWL_RATE_COUNT; i++)
593 rs_rate_scale_clear_window(&tbl->win[i]);
594
595 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
596 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
597 }
598
599 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
600 {
601 return (ant_type & valid_antenna) == ant_type;
602 }
603
604 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
605 struct iwl_lq_sta *lq_data, u8 tid,
606 struct ieee80211_sta *sta)
607 {
608 int ret = -EAGAIN;
609
610 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
611 sta->addr, tid);
612 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
613 if (ret == -EAGAIN) {
614 /*
615 * driver and mac80211 is out of sync
616 * this might be cause by reloading firmware
617 * stop the tx ba session here
618 */
619 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
620 tid);
621 ieee80211_stop_tx_ba_session(sta, tid);
622 }
623 return ret;
624 }
625
626 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
627 struct iwl_lq_sta *lq_data,
628 struct ieee80211_sta *sta)
629 {
630 if (tid < IWL_MAX_TID_COUNT)
631 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
632 else
633 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
634 tid, IWL_MAX_TID_COUNT);
635 }
636
637 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
638 {
639 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
640 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
641 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
642 }
643
644 /*
645 * Static function to get the expected throughput from an iwl_scale_tbl_info
646 * that wraps a NULL pointer check
647 */
648 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
649 {
650 if (tbl->expected_tpt)
651 return tbl->expected_tpt[rs_index];
652 return 0;
653 }
654
655 /**
656 * rs_collect_tx_data - Update the success/failure sliding window
657 *
658 * We keep a sliding window of the last 62 packets transmitted
659 * at this rate. window->data contains the bitmask of successful
660 * packets.
661 */
662 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
663 struct iwl_scale_tbl_info *tbl,
664 int scale_index, int attempts, int successes,
665 struct iwl_rate_scale_data *window)
666 {
667 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
668 s32 fail_count, tpt;
669
670 /* Get expected throughput */
671 tpt = get_expected_tpt(tbl, scale_index);
672
673 /*
674 * Keep track of only the latest 62 tx frame attempts in this rate's
675 * history window; anything older isn't really relevant any more.
676 * If we have filled up the sliding window, drop the oldest attempt;
677 * if the oldest attempt (highest bit in bitmap) shows "success",
678 * subtract "1" from the success counter (this is the main reason
679 * we keep these bitmaps!).
680 */
681 while (attempts > 0) {
682 if (window->counter >= IWL_RATE_MAX_WINDOW) {
683 /* remove earliest */
684 window->counter = IWL_RATE_MAX_WINDOW - 1;
685
686 if (window->data & mask) {
687 window->data &= ~mask;
688 window->success_counter--;
689 }
690 }
691
692 /* Increment frames-attempted counter */
693 window->counter++;
694
695 /* Shift bitmap by one frame to throw away oldest history */
696 window->data <<= 1;
697
698 /* Mark the most recent #successes attempts as successful */
699 if (successes > 0) {
700 window->success_counter++;
701 window->data |= 0x1;
702 successes--;
703 }
704
705 attempts--;
706 }
707
708 /* Calculate current success ratio, avoid divide-by-0! */
709 if (window->counter > 0)
710 window->success_ratio = 128 * (100 * window->success_counter)
711 / window->counter;
712 else
713 window->success_ratio = IWL_INVALID_VALUE;
714
715 fail_count = window->counter - window->success_counter;
716
717 /* Calculate average throughput, if we have enough history. */
718 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
719 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
720 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
721 else
722 window->average_tpt = IWL_INVALID_VALUE;
723
724 return 0;
725 }
726
727 static int rs_collect_tx_data(struct iwl_mvm *mvm,
728 struct iwl_lq_sta *lq_sta,
729 struct iwl_scale_tbl_info *tbl,
730 int scale_index, int attempts, int successes,
731 u8 reduced_txp)
732 {
733 struct iwl_rate_scale_data *window = NULL;
734 int ret;
735
736 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
737 return -EINVAL;
738
739 if (tbl->column != RS_COLUMN_INVALID) {
740 struct lq_sta_pers *pers = &lq_sta->pers;
741
742 pers->tx_stats[tbl->column][scale_index].total += attempts;
743 pers->tx_stats[tbl->column][scale_index].success += successes;
744 }
745
746 /* Select window for current tx bit rate */
747 window = &(tbl->win[scale_index]);
748
749 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
750 window);
751 if (ret)
752 return ret;
753
754 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
755 return -EINVAL;
756
757 window = &tbl->tpc_win[reduced_txp];
758 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
759 window);
760 }
761
762 /* Convert rs_rate object into ucode rate bitmask */
763 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
764 struct rs_rate *rate)
765 {
766 u32 ucode_rate = 0;
767 int index = rate->index;
768
769 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
770 RATE_MCS_ANT_ABC_MSK);
771
772 if (is_legacy(rate)) {
773 ucode_rate |= iwl_rates[index].plcp;
774 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
775 ucode_rate |= RATE_MCS_CCK_MSK;
776 return ucode_rate;
777 }
778
779 if (is_ht(rate)) {
780 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
781 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
782 index = IWL_LAST_HT_RATE;
783 }
784 ucode_rate |= RATE_MCS_HT_MSK;
785
786 if (is_ht_siso(rate))
787 ucode_rate |= iwl_rates[index].plcp_ht_siso;
788 else if (is_ht_mimo2(rate))
789 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
790 else
791 WARN_ON_ONCE(1);
792 } else if (is_vht(rate)) {
793 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
794 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
795 index = IWL_LAST_VHT_RATE;
796 }
797 ucode_rate |= RATE_MCS_VHT_MSK;
798 if (is_vht_siso(rate))
799 ucode_rate |= iwl_rates[index].plcp_vht_siso;
800 else if (is_vht_mimo2(rate))
801 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
802 else
803 WARN_ON_ONCE(1);
804
805 } else {
806 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
807 }
808
809 if (is_siso(rate) && rate->stbc) {
810 /* To enable STBC we need to set both a flag and ANT_AB */
811 ucode_rate |= RATE_MCS_ANT_AB_MSK;
812 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
813 }
814
815 ucode_rate |= rate->bw;
816 if (rate->sgi)
817 ucode_rate |= RATE_MCS_SGI_MSK;
818 if (rate->ldpc)
819 ucode_rate |= RATE_MCS_LDPC_MSK;
820
821 return ucode_rate;
822 }
823
824 /* Convert a ucode rate into an rs_rate object */
825 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
826 enum ieee80211_band band,
827 struct rs_rate *rate)
828 {
829 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
830 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
831 u8 nss;
832
833 memset(rate, 0, sizeof(*rate));
834 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
835
836 if (rate->index == IWL_RATE_INVALID)
837 return -EINVAL;
838
839 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
840
841 /* Legacy */
842 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
843 !(ucode_rate & RATE_MCS_VHT_MSK)) {
844 if (num_of_ant == 1) {
845 if (band == IEEE80211_BAND_5GHZ)
846 rate->type = LQ_LEGACY_A;
847 else
848 rate->type = LQ_LEGACY_G;
849 }
850
851 return 0;
852 }
853
854 /* HT or VHT */
855 if (ucode_rate & RATE_MCS_SGI_MSK)
856 rate->sgi = true;
857 if (ucode_rate & RATE_MCS_LDPC_MSK)
858 rate->ldpc = true;
859 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
860 rate->stbc = true;
861 if (ucode_rate & RATE_MCS_BF_MSK)
862 rate->bfer = true;
863
864 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
865
866 if (ucode_rate & RATE_MCS_HT_MSK) {
867 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
868 RATE_HT_MCS_NSS_POS) + 1;
869
870 if (nss == 1) {
871 rate->type = LQ_HT_SISO;
872 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
873 "stbc %d bfer %d",
874 rate->stbc, rate->bfer);
875 } else if (nss == 2) {
876 rate->type = LQ_HT_MIMO2;
877 WARN_ON_ONCE(num_of_ant != 2);
878 } else {
879 WARN_ON_ONCE(1);
880 }
881 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
882 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
883 RATE_VHT_MCS_NSS_POS) + 1;
884
885 if (nss == 1) {
886 rate->type = LQ_VHT_SISO;
887 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
888 "stbc %d bfer %d",
889 rate->stbc, rate->bfer);
890 } else if (nss == 2) {
891 rate->type = LQ_VHT_MIMO2;
892 WARN_ON_ONCE(num_of_ant != 2);
893 } else {
894 WARN_ON_ONCE(1);
895 }
896 }
897
898 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
899 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
900 !is_vht(rate));
901
902 return 0;
903 }
904
905 /* switch to another antenna/antennas and return 1 */
906 /* if no other valid antenna found, return 0 */
907 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
908 {
909 u8 new_ant_type;
910
911 if (!rate->ant || rate->ant > ANT_ABC)
912 return 0;
913
914 if (!rs_is_valid_ant(valid_ant, rate->ant))
915 return 0;
916
917 new_ant_type = ant_toggle_lookup[rate->ant];
918
919 while ((new_ant_type != rate->ant) &&
920 !rs_is_valid_ant(valid_ant, new_ant_type))
921 new_ant_type = ant_toggle_lookup[new_ant_type];
922
923 if (new_ant_type == rate->ant)
924 return 0;
925
926 rate->ant = new_ant_type;
927
928 return 1;
929 }
930
931 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
932 struct rs_rate *rate)
933 {
934 if (is_legacy(rate))
935 return lq_sta->active_legacy_rate;
936 else if (is_siso(rate))
937 return lq_sta->active_siso_rate;
938 else if (is_mimo2(rate))
939 return lq_sta->active_mimo2_rate;
940
941 WARN_ON_ONCE(1);
942 return 0;
943 }
944
945 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
946 int rate_type)
947 {
948 u8 high = IWL_RATE_INVALID;
949 u8 low = IWL_RATE_INVALID;
950
951 /* 802.11A or ht walks to the next literal adjacent rate in
952 * the rate table */
953 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
954 int i;
955 u32 mask;
956
957 /* Find the previous rate that is in the rate mask */
958 i = index - 1;
959 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
960 if (rate_mask & mask) {
961 low = i;
962 break;
963 }
964 }
965
966 /* Find the next rate that is in the rate mask */
967 i = index + 1;
968 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
969 if (rate_mask & mask) {
970 high = i;
971 break;
972 }
973 }
974
975 return (high << 8) | low;
976 }
977
978 low = index;
979 while (low != IWL_RATE_INVALID) {
980 low = iwl_rates[low].prev_rs;
981 if (low == IWL_RATE_INVALID)
982 break;
983 if (rate_mask & (1 << low))
984 break;
985 }
986
987 high = index;
988 while (high != IWL_RATE_INVALID) {
989 high = iwl_rates[high].next_rs;
990 if (high == IWL_RATE_INVALID)
991 break;
992 if (rate_mask & (1 << high))
993 break;
994 }
995
996 return (high << 8) | low;
997 }
998
999 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1000 struct rs_rate *rate)
1001 {
1002 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1003 }
1004
1005 /* Get the next supported lower rate in the current column.
1006 * Return true if bottom rate in the current column was reached
1007 */
1008 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1009 struct rs_rate *rate)
1010 {
1011 u8 low;
1012 u16 high_low;
1013 u16 rate_mask;
1014 struct iwl_mvm *mvm = lq_sta->pers.drv;
1015
1016 rate_mask = rs_get_supported_rates(lq_sta, rate);
1017 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1018 rate->type);
1019 low = high_low & 0xff;
1020
1021 /* Bottom rate of column reached */
1022 if (low == IWL_RATE_INVALID)
1023 return true;
1024
1025 rate->index = low;
1026 return false;
1027 }
1028
1029 /* Get the next rate to use following a column downgrade */
1030 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1031 struct rs_rate *rate)
1032 {
1033 struct iwl_mvm *mvm = lq_sta->pers.drv;
1034
1035 if (is_legacy(rate)) {
1036 /* No column to downgrade from Legacy */
1037 return;
1038 } else if (is_siso(rate)) {
1039 /* Downgrade to Legacy if we were in SISO */
1040 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1041 rate->type = LQ_LEGACY_A;
1042 else
1043 rate->type = LQ_LEGACY_G;
1044
1045 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1046
1047 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1048 rate->index > IWL_RATE_MCS_9_INDEX);
1049
1050 rate->index = rs_ht_to_legacy[rate->index];
1051 rate->ldpc = false;
1052 } else {
1053 /* Downgrade to SISO with same MCS if in MIMO */
1054 rate->type = is_vht_mimo2(rate) ?
1055 LQ_VHT_SISO : LQ_HT_SISO;
1056 }
1057
1058 if (num_of_ant(rate->ant) > 1)
1059 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1060
1061 /* Relevant in both switching to SISO or Legacy */
1062 rate->sgi = false;
1063
1064 if (!rs_rate_supported(lq_sta, rate))
1065 rs_get_lower_rate_in_column(lq_sta, rate);
1066 }
1067
1068 /* Check if both rates are identical
1069 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1070 * with a rate indicating STBC/BFER and ANT_AB.
1071 */
1072 static inline bool rs_rate_equal(struct rs_rate *a,
1073 struct rs_rate *b,
1074 bool allow_ant_mismatch)
1075
1076 {
1077 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1078 (a->bfer == b->bfer);
1079
1080 if (allow_ant_mismatch) {
1081 if (a->stbc || a->bfer) {
1082 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1083 a->stbc, a->bfer, a->ant);
1084 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1085 } else if (b->stbc || b->bfer) {
1086 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1087 b->stbc, b->bfer, b->ant);
1088 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1089 }
1090 }
1091
1092 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1093 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1094 }
1095
1096 /* Check if both rates share the same column */
1097 static inline bool rs_rate_column_match(struct rs_rate *a,
1098 struct rs_rate *b)
1099 {
1100 bool ant_match;
1101
1102 if (a->stbc || a->bfer)
1103 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1104 else
1105 ant_match = (a->ant == b->ant);
1106
1107 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1108 && ant_match;
1109 }
1110
1111 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1112 {
1113 if (is_legacy(rate)) {
1114 if (rate->ant == ANT_A)
1115 return RS_COLUMN_LEGACY_ANT_A;
1116
1117 if (rate->ant == ANT_B)
1118 return RS_COLUMN_LEGACY_ANT_B;
1119
1120 goto err;
1121 }
1122
1123 if (is_siso(rate)) {
1124 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1125 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1126 RS_COLUMN_SISO_ANT_A;
1127
1128 if (rate->ant == ANT_B)
1129 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1130 RS_COLUMN_SISO_ANT_B;
1131
1132 goto err;
1133 }
1134
1135 if (is_mimo(rate))
1136 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1137
1138 err:
1139 return RS_COLUMN_INVALID;
1140 }
1141
1142 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1143 {
1144 u8 tid = IWL_MAX_TID_COUNT;
1145
1146 if (ieee80211_is_data_qos(hdr->frame_control)) {
1147 u8 *qc = ieee80211_get_qos_ctl(hdr);
1148 tid = qc[0] & 0xf;
1149 }
1150
1151 if (unlikely(tid > IWL_MAX_TID_COUNT))
1152 tid = IWL_MAX_TID_COUNT;
1153
1154 return tid;
1155 }
1156
1157 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1158 int tid, struct ieee80211_tx_info *info)
1159 {
1160 int legacy_success;
1161 int retries;
1162 int i;
1163 struct iwl_lq_cmd *table;
1164 u32 lq_hwrate;
1165 struct rs_rate lq_rate, tx_resp_rate;
1166 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1167 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1168 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1169 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1170 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1171 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1172 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1173
1174 /* Treat uninitialized rate scaling data same as non-existing. */
1175 if (!lq_sta) {
1176 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1177 return;
1178 } else if (!lq_sta->pers.drv) {
1179 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1180 return;
1181 }
1182
1183 /* This packet was aggregated but doesn't carry status info */
1184 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1185 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1186 return;
1187
1188 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1189
1190 #ifdef CONFIG_MAC80211_DEBUGFS
1191 /* Disable last tx check if we are debugging with fixed rate but
1192 * update tx stats */
1193 if (lq_sta->pers.dbg_fixed_rate) {
1194 int index = tx_resp_rate.index;
1195 enum rs_column column;
1196 int attempts, success;
1197
1198 column = rs_get_column_from_rate(&tx_resp_rate);
1199 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1200 "Can't map rate 0x%x to column",
1201 tx_resp_hwrate))
1202 return;
1203
1204 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1205 attempts = info->status.ampdu_len;
1206 success = info->status.ampdu_ack_len;
1207 } else {
1208 attempts = info->status.rates[0].count;
1209 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1210 }
1211
1212 lq_sta->pers.tx_stats[column][index].total += attempts;
1213 lq_sta->pers.tx_stats[column][index].success += success;
1214
1215 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1216 tx_resp_hwrate, success, attempts);
1217 return;
1218 }
1219 #endif
1220
1221 if (time_after(jiffies,
1222 (unsigned long)(lq_sta->last_tx +
1223 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1224 int t;
1225
1226 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1227 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1228 ieee80211_stop_tx_ba_session(sta, t);
1229
1230 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1231 return;
1232 }
1233 lq_sta->last_tx = jiffies;
1234
1235 /* Ignore this Tx frame response if its initial rate doesn't match
1236 * that of latest Link Quality command. There may be stragglers
1237 * from a previous Link Quality command, but we're no longer interested
1238 * in those; they're either from the "active" mode while we're trying
1239 * to check "search" mode, or a prior "search" mode after we've moved
1240 * to a new "search" mode (which might become the new "active" mode).
1241 */
1242 table = &lq_sta->lq;
1243 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1244 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1245
1246 /* Here we actually compare this rate to the latest LQ command */
1247 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1248 IWL_DEBUG_RATE(mvm,
1249 "initial tx resp rate 0x%x does not match 0x%x\n",
1250 tx_resp_hwrate, lq_hwrate);
1251
1252 /*
1253 * Since rates mis-match, the last LQ command may have failed.
1254 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1255 * ... driver.
1256 */
1257 lq_sta->missed_rate_counter++;
1258 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1259 lq_sta->missed_rate_counter = 0;
1260 IWL_DEBUG_RATE(mvm,
1261 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1262 lq_sta->rs_state);
1263 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1264 }
1265 /* Regardless, ignore this status info for outdated rate */
1266 return;
1267 } else
1268 /* Rate did match, so reset the missed_rate_counter */
1269 lq_sta->missed_rate_counter = 0;
1270
1271 if (!lq_sta->search_better_tbl) {
1272 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1273 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1274 } else {
1275 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1276 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1277 }
1278
1279 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1280 IWL_DEBUG_RATE(mvm,
1281 "Neither active nor search matches tx rate\n");
1282 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1283 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1284 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1285 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1286 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1287
1288 /*
1289 * no matching table found, let's by-pass the data collection
1290 * and continue to perform rate scale to find the rate table
1291 */
1292 rs_stay_in_table(lq_sta, true);
1293 goto done;
1294 }
1295
1296 /*
1297 * Updating the frame history depends on whether packets were
1298 * aggregated.
1299 *
1300 * For aggregation, all packets were transmitted at the same rate, the
1301 * first index into rate scale table.
1302 */
1303 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1304 /* ampdu_ack_len = 0 marks no BA was received. In this case
1305 * treat it as a single frame loss as we don't want the success
1306 * ratio to dip too quickly because a BA wasn't received
1307 */
1308 if (info->status.ampdu_ack_len == 0)
1309 info->status.ampdu_len = 1;
1310
1311 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1312 info->status.ampdu_len,
1313 info->status.ampdu_ack_len,
1314 reduced_txp);
1315
1316 /* Update success/fail counts if not searching for new mode */
1317 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1318 lq_sta->total_success += info->status.ampdu_ack_len;
1319 lq_sta->total_failed += (info->status.ampdu_len -
1320 info->status.ampdu_ack_len);
1321 }
1322 } else {
1323 /* For legacy, update frame history with for each Tx retry. */
1324 retries = info->status.rates[0].count - 1;
1325 /* HW doesn't send more than 15 retries */
1326 retries = min(retries, 15);
1327
1328 /* The last transmission may have been successful */
1329 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1330 /* Collect data for each rate used during failed TX attempts */
1331 for (i = 0; i <= retries; ++i) {
1332 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1333 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1334 &lq_rate);
1335 /*
1336 * Only collect stats if retried rate is in the same RS
1337 * table as active/search.
1338 */
1339 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1340 tmp_tbl = curr_tbl;
1341 else if (rs_rate_column_match(&lq_rate,
1342 &other_tbl->rate))
1343 tmp_tbl = other_tbl;
1344 else
1345 continue;
1346
1347 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1348 1, i < retries ? 0 : legacy_success,
1349 reduced_txp);
1350 }
1351
1352 /* Update success/fail counts if not searching for new mode */
1353 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1354 lq_sta->total_success += legacy_success;
1355 lq_sta->total_failed += retries + (1 - legacy_success);
1356 }
1357 }
1358 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1359 lq_sta->last_rate_n_flags = lq_hwrate;
1360 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1361 done:
1362 /* See if there's a better rate or modulation mode to try. */
1363 if (sta->supp_rates[info->band])
1364 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1365 }
1366
1367 /*
1368 * mac80211 sends us Tx status
1369 */
1370 static void rs_mac80211_tx_status(void *mvm_r,
1371 struct ieee80211_supported_band *sband,
1372 struct ieee80211_sta *sta, void *priv_sta,
1373 struct sk_buff *skb)
1374 {
1375 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1376 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1377 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1379
1380 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1381 return;
1382
1383 if (!ieee80211_is_data(hdr->frame_control) ||
1384 info->flags & IEEE80211_TX_CTL_NO_ACK)
1385 return;
1386
1387 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1388 }
1389
1390 /*
1391 * Begin a period of staying with a selected modulation mode.
1392 * Set "stay_in_tbl" flag to prevent any mode switches.
1393 * Set frame tx success limits according to legacy vs. high-throughput,
1394 * and reset overall (spanning all rates) tx success history statistics.
1395 * These control how long we stay using same modulation mode before
1396 * searching for a new mode.
1397 */
1398 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1399 struct iwl_lq_sta *lq_sta)
1400 {
1401 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1402 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1403 if (is_legacy) {
1404 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1405 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1406 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1407 } else {
1408 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1409 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1410 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1411 }
1412 lq_sta->table_count = 0;
1413 lq_sta->total_failed = 0;
1414 lq_sta->total_success = 0;
1415 lq_sta->flush_timer = jiffies;
1416 lq_sta->visited_columns = 0;
1417 }
1418
1419 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1420 {
1421 if (rate_mask)
1422 return find_last_bit(&rate_mask, BITS_PER_LONG);
1423 return IWL_RATE_INVALID;
1424 }
1425
1426 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1427 const struct rs_tx_column *column)
1428 {
1429 switch (column->mode) {
1430 case RS_LEGACY:
1431 return lq_sta->max_legacy_rate_idx;
1432 case RS_SISO:
1433 return lq_sta->max_siso_rate_idx;
1434 case RS_MIMO2:
1435 return lq_sta->max_mimo2_rate_idx;
1436 default:
1437 WARN_ON_ONCE(1);
1438 }
1439
1440 return lq_sta->max_legacy_rate_idx;
1441 }
1442
1443 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1444 const struct rs_tx_column *column,
1445 u32 bw)
1446 {
1447 /* Used to choose among HT tables */
1448 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1449
1450 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1451 column->mode != RS_SISO &&
1452 column->mode != RS_MIMO2))
1453 return expected_tpt_legacy;
1454
1455 /* Legacy rates have only one table */
1456 if (column->mode == RS_LEGACY)
1457 return expected_tpt_legacy;
1458
1459 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1460 /* Choose among many HT tables depending on number of streams
1461 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1462 * status */
1463 if (column->mode == RS_SISO) {
1464 switch (bw) {
1465 case RATE_MCS_CHAN_WIDTH_20:
1466 ht_tbl_pointer = expected_tpt_siso_20MHz;
1467 break;
1468 case RATE_MCS_CHAN_WIDTH_40:
1469 ht_tbl_pointer = expected_tpt_siso_40MHz;
1470 break;
1471 case RATE_MCS_CHAN_WIDTH_80:
1472 ht_tbl_pointer = expected_tpt_siso_80MHz;
1473 break;
1474 default:
1475 WARN_ON_ONCE(1);
1476 }
1477 } else if (column->mode == RS_MIMO2) {
1478 switch (bw) {
1479 case RATE_MCS_CHAN_WIDTH_20:
1480 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1481 break;
1482 case RATE_MCS_CHAN_WIDTH_40:
1483 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1484 break;
1485 case RATE_MCS_CHAN_WIDTH_80:
1486 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1487 break;
1488 default:
1489 WARN_ON_ONCE(1);
1490 }
1491 } else {
1492 WARN_ON_ONCE(1);
1493 }
1494
1495 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1496 return ht_tbl_pointer[0];
1497 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1498 return ht_tbl_pointer[1];
1499 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1500 return ht_tbl_pointer[2];
1501 else /* AGG+SGI */
1502 return ht_tbl_pointer[3];
1503 }
1504
1505 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1506 struct iwl_scale_tbl_info *tbl)
1507 {
1508 struct rs_rate *rate = &tbl->rate;
1509 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1510
1511 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1512 }
1513
1514 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1515 struct iwl_lq_sta *lq_sta,
1516 struct iwl_scale_tbl_info *tbl, /* "search" */
1517 unsigned long rate_mask, s8 index)
1518 {
1519 struct iwl_scale_tbl_info *active_tbl =
1520 &(lq_sta->lq_info[lq_sta->active_tbl]);
1521 s32 success_ratio = active_tbl->win[index].success_ratio;
1522 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1523 const u16 *tpt_tbl = tbl->expected_tpt;
1524 u16 high_low;
1525 u32 target_tpt;
1526 int rate_idx;
1527
1528 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1529 target_tpt = 100 * expected_current_tpt;
1530 IWL_DEBUG_RATE(mvm,
1531 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1532 success_ratio, target_tpt);
1533 } else {
1534 target_tpt = lq_sta->last_tpt;
1535 IWL_DEBUG_RATE(mvm,
1536 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1537 success_ratio, target_tpt);
1538 }
1539
1540 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1541
1542 while (rate_idx != IWL_RATE_INVALID) {
1543 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1544 break;
1545
1546 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1547 tbl->rate.type);
1548
1549 rate_idx = (high_low >> 8) & 0xff;
1550 }
1551
1552 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1553 rate_idx, target_tpt,
1554 rate_idx != IWL_RATE_INVALID ?
1555 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1556
1557 return rate_idx;
1558 }
1559
1560 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1561 {
1562 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1563 return RATE_MCS_CHAN_WIDTH_80;
1564 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1565 return RATE_MCS_CHAN_WIDTH_40;
1566
1567 return RATE_MCS_CHAN_WIDTH_20;
1568 }
1569
1570 /*
1571 * Check whether we should continue using same modulation mode, or
1572 * begin search for a new mode, based on:
1573 * 1) # tx successes or failures while using this mode
1574 * 2) # times calling this function
1575 * 3) elapsed time in this mode (not used, for now)
1576 */
1577 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1578 {
1579 struct iwl_scale_tbl_info *tbl;
1580 int active_tbl;
1581 int flush_interval_passed = 0;
1582 struct iwl_mvm *mvm;
1583
1584 mvm = lq_sta->pers.drv;
1585 active_tbl = lq_sta->active_tbl;
1586
1587 tbl = &(lq_sta->lq_info[active_tbl]);
1588
1589 /* If we've been disallowing search, see if we should now allow it */
1590 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1591 /* Elapsed time using current modulation mode */
1592 if (lq_sta->flush_timer)
1593 flush_interval_passed =
1594 time_after(jiffies,
1595 (unsigned long)(lq_sta->flush_timer +
1596 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1597
1598 /*
1599 * Check if we should allow search for new modulation mode.
1600 * If many frames have failed or succeeded, or we've used
1601 * this same modulation for a long time, allow search, and
1602 * reset history stats that keep track of whether we should
1603 * allow a new search. Also (below) reset all bitmaps and
1604 * stats in active history.
1605 */
1606 if (force_search ||
1607 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1608 (lq_sta->total_success > lq_sta->max_success_limit) ||
1609 ((!lq_sta->search_better_tbl) &&
1610 (lq_sta->flush_timer) && (flush_interval_passed))) {
1611 IWL_DEBUG_RATE(mvm,
1612 "LQ: stay is expired %d %d %d\n",
1613 lq_sta->total_failed,
1614 lq_sta->total_success,
1615 flush_interval_passed);
1616
1617 /* Allow search for new mode */
1618 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1619 IWL_DEBUG_RATE(mvm,
1620 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1621 lq_sta->total_failed = 0;
1622 lq_sta->total_success = 0;
1623 lq_sta->flush_timer = 0;
1624 /* mark the current column as visited */
1625 lq_sta->visited_columns = BIT(tbl->column);
1626 /*
1627 * Else if we've used this modulation mode enough repetitions
1628 * (regardless of elapsed time or success/failure), reset
1629 * history bitmaps and rate-specific stats for all rates in
1630 * active table.
1631 */
1632 } else {
1633 lq_sta->table_count++;
1634 if (lq_sta->table_count >=
1635 lq_sta->table_count_limit) {
1636 lq_sta->table_count = 0;
1637
1638 IWL_DEBUG_RATE(mvm,
1639 "LQ: stay in table clear win\n");
1640 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1641 }
1642 }
1643
1644 /* If transitioning to allow "search", reset all history
1645 * bitmaps and stats in active table (this will become the new
1646 * "search" table). */
1647 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1648 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1649 }
1650 }
1651 }
1652
1653 /*
1654 * setup rate table in uCode
1655 */
1656 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1657 struct ieee80211_sta *sta,
1658 struct iwl_lq_sta *lq_sta,
1659 struct iwl_scale_tbl_info *tbl)
1660 {
1661 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1662 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1663 }
1664
1665 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1666 struct ieee80211_sta *sta,
1667 struct iwl_lq_sta *lq_sta,
1668 struct iwl_scale_tbl_info *tbl,
1669 enum rs_action scale_action)
1670 {
1671 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1672 return false;
1673
1674 if (!is_vht_siso(&tbl->rate))
1675 return false;
1676
1677 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1678 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1679 (scale_action == RS_ACTION_DOWNSCALE)) {
1680 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1681 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1682 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1683 goto tweaked;
1684 }
1685
1686 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1687 * sustainable, i.e. we're past the test window. We can't go back
1688 * if MCS5 is just tested as this will happen always after switching
1689 * to 20Mhz MCS4 because the rate stats are cleared.
1690 */
1691 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1692 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1693 (scale_action == RS_ACTION_STAY)) ||
1694 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1695 (scale_action == RS_ACTION_UPSCALE)))) {
1696 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1697 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1698 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1699 goto tweaked;
1700 }
1701
1702 return false;
1703
1704 tweaked:
1705 rs_set_expected_tpt_table(lq_sta, tbl);
1706 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1707 return true;
1708 }
1709
1710 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1711 struct iwl_lq_sta *lq_sta,
1712 struct ieee80211_sta *sta,
1713 struct iwl_scale_tbl_info *tbl)
1714 {
1715 int i, j, max_rate;
1716 enum rs_column next_col_id;
1717 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1718 const struct rs_tx_column *next_col;
1719 allow_column_func_t allow_func;
1720 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1721 const u16 *expected_tpt_tbl;
1722 u16 tpt, max_expected_tpt;
1723
1724 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1725 next_col_id = curr_col->next_columns[i];
1726
1727 if (next_col_id == RS_COLUMN_INVALID)
1728 continue;
1729
1730 if (lq_sta->visited_columns & BIT(next_col_id)) {
1731 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1732 next_col_id);
1733 continue;
1734 }
1735
1736 next_col = &rs_tx_columns[next_col_id];
1737
1738 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1739 IWL_DEBUG_RATE(mvm,
1740 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1741 next_col_id, valid_ants, next_col->ant);
1742 continue;
1743 }
1744
1745 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1746 allow_func = next_col->checks[j];
1747 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1748 next_col))
1749 break;
1750 }
1751
1752 if (j != MAX_COLUMN_CHECKS) {
1753 IWL_DEBUG_RATE(mvm,
1754 "Skip column %d: not allowed (check %d failed)\n",
1755 next_col_id, j);
1756
1757 continue;
1758 }
1759
1760 tpt = lq_sta->last_tpt / 100;
1761 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1762 rs_bw_from_sta_bw(sta));
1763 if (WARN_ON_ONCE(!expected_tpt_tbl))
1764 continue;
1765
1766 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1767 if (max_rate == IWL_RATE_INVALID) {
1768 IWL_DEBUG_RATE(mvm,
1769 "Skip column %d: no rate is allowed in this column\n",
1770 next_col_id);
1771 continue;
1772 }
1773
1774 max_expected_tpt = expected_tpt_tbl[max_rate];
1775 if (tpt >= max_expected_tpt) {
1776 IWL_DEBUG_RATE(mvm,
1777 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1778 next_col_id, max_expected_tpt, tpt);
1779 continue;
1780 }
1781
1782 IWL_DEBUG_RATE(mvm,
1783 "Found potential column %d. Max expected %d current %d\n",
1784 next_col_id, max_expected_tpt, tpt);
1785 break;
1786 }
1787
1788 if (i == MAX_NEXT_COLUMNS)
1789 return RS_COLUMN_INVALID;
1790
1791 return next_col_id;
1792 }
1793
1794 static int rs_switch_to_column(struct iwl_mvm *mvm,
1795 struct iwl_lq_sta *lq_sta,
1796 struct ieee80211_sta *sta,
1797 enum rs_column col_id)
1798 {
1799 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1800 struct iwl_scale_tbl_info *search_tbl =
1801 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1802 struct rs_rate *rate = &search_tbl->rate;
1803 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1804 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1805 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1806 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1807 unsigned long rate_mask = 0;
1808 u32 rate_idx = 0;
1809
1810 memcpy(search_tbl, tbl, sz);
1811
1812 rate->sgi = column->sgi;
1813 rate->ant = column->ant;
1814
1815 if (column->mode == RS_LEGACY) {
1816 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1817 rate->type = LQ_LEGACY_A;
1818 else
1819 rate->type = LQ_LEGACY_G;
1820
1821 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1822 rate->ldpc = false;
1823 rate_mask = lq_sta->active_legacy_rate;
1824 } else if (column->mode == RS_SISO) {
1825 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1826 rate_mask = lq_sta->active_siso_rate;
1827 } else if (column->mode == RS_MIMO2) {
1828 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1829 rate_mask = lq_sta->active_mimo2_rate;
1830 } else {
1831 WARN_ONCE(1, "Bad column mode");
1832 }
1833
1834 if (column->mode != RS_LEGACY) {
1835 rate->bw = rs_bw_from_sta_bw(sta);
1836 rate->ldpc = lq_sta->ldpc;
1837 }
1838
1839 search_tbl->column = col_id;
1840 rs_set_expected_tpt_table(lq_sta, search_tbl);
1841
1842 lq_sta->visited_columns |= BIT(col_id);
1843
1844 /* Get the best matching rate if we're changing modes. e.g.
1845 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1846 */
1847 if (curr_column->mode != column->mode) {
1848 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1849 rate_mask, rate->index);
1850
1851 if ((rate_idx == IWL_RATE_INVALID) ||
1852 !(BIT(rate_idx) & rate_mask)) {
1853 IWL_DEBUG_RATE(mvm,
1854 "can not switch with index %d"
1855 " rate mask %lx\n",
1856 rate_idx, rate_mask);
1857
1858 goto err;
1859 }
1860
1861 rate->index = rate_idx;
1862 }
1863
1864 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1865 col_id, rate->index);
1866
1867 return 0;
1868
1869 err:
1870 rate->type = LQ_NONE;
1871 return -1;
1872 }
1873
1874 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1875 struct iwl_scale_tbl_info *tbl,
1876 s32 sr, int low, int high,
1877 int current_tpt,
1878 int low_tpt, int high_tpt)
1879 {
1880 enum rs_action action = RS_ACTION_STAY;
1881
1882 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1883 (current_tpt == 0)) {
1884 IWL_DEBUG_RATE(mvm,
1885 "Decrease rate because of low SR\n");
1886 return RS_ACTION_DOWNSCALE;
1887 }
1888
1889 if ((low_tpt == IWL_INVALID_VALUE) &&
1890 (high_tpt == IWL_INVALID_VALUE) &&
1891 (high != IWL_RATE_INVALID)) {
1892 IWL_DEBUG_RATE(mvm,
1893 "No data about high/low rates. Increase rate\n");
1894 return RS_ACTION_UPSCALE;
1895 }
1896
1897 if ((high_tpt == IWL_INVALID_VALUE) &&
1898 (high != IWL_RATE_INVALID) &&
1899 (low_tpt != IWL_INVALID_VALUE) &&
1900 (low_tpt < current_tpt)) {
1901 IWL_DEBUG_RATE(mvm,
1902 "No data about high rate and low rate is worse. Increase rate\n");
1903 return RS_ACTION_UPSCALE;
1904 }
1905
1906 if ((high_tpt != IWL_INVALID_VALUE) &&
1907 (high_tpt > current_tpt)) {
1908 IWL_DEBUG_RATE(mvm,
1909 "Higher rate is better. Increate rate\n");
1910 return RS_ACTION_UPSCALE;
1911 }
1912
1913 if ((low_tpt != IWL_INVALID_VALUE) &&
1914 (high_tpt != IWL_INVALID_VALUE) &&
1915 (low_tpt < current_tpt) &&
1916 (high_tpt < current_tpt)) {
1917 IWL_DEBUG_RATE(mvm,
1918 "Both high and low are worse. Maintain rate\n");
1919 return RS_ACTION_STAY;
1920 }
1921
1922 if ((low_tpt != IWL_INVALID_VALUE) &&
1923 (low_tpt > current_tpt)) {
1924 IWL_DEBUG_RATE(mvm,
1925 "Lower rate is better\n");
1926 action = RS_ACTION_DOWNSCALE;
1927 goto out;
1928 }
1929
1930 if ((low_tpt == IWL_INVALID_VALUE) &&
1931 (low != IWL_RATE_INVALID)) {
1932 IWL_DEBUG_RATE(mvm,
1933 "No data about lower rate\n");
1934 action = RS_ACTION_DOWNSCALE;
1935 goto out;
1936 }
1937
1938 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1939
1940 out:
1941 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1942 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1943 IWL_DEBUG_RATE(mvm,
1944 "SR is above NO DECREASE. Avoid downscale\n");
1945 action = RS_ACTION_STAY;
1946 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1947 IWL_DEBUG_RATE(mvm,
1948 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1949 action = RS_ACTION_STAY;
1950 } else {
1951 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1952 }
1953 }
1954
1955 return action;
1956 }
1957
1958 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1959 struct iwl_lq_sta *lq_sta)
1960 {
1961 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1962 * supports STBC of at least 1*SS
1963 */
1964 if (!lq_sta->stbc_capable)
1965 return false;
1966
1967 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1968 return false;
1969
1970 return true;
1971 }
1972
1973 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1974 int *weaker, int *stronger)
1975 {
1976 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1977 if (*weaker > TPC_MAX_REDUCTION)
1978 *weaker = TPC_INVALID;
1979
1980 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1981 if (*stronger < 0)
1982 *stronger = TPC_INVALID;
1983 }
1984
1985 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1986 struct rs_rate *rate, enum ieee80211_band band)
1987 {
1988 int index = rate->index;
1989 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1990 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1991 !vif->bss_conf.ps);
1992
1993 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1994 cam, sta_ps_disabled);
1995 /*
1996 * allow tpc only if power management is enabled, or bt coex
1997 * activity grade allows it and we are on 2.4Ghz.
1998 */
1999 if ((cam || sta_ps_disabled) &&
2000 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2001 return false;
2002
2003 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2004 if (is_legacy(rate))
2005 return index == IWL_RATE_54M_INDEX;
2006 if (is_ht(rate))
2007 return index == IWL_RATE_MCS_7_INDEX;
2008 if (is_vht(rate))
2009 return index == IWL_RATE_MCS_7_INDEX ||
2010 index == IWL_RATE_MCS_8_INDEX ||
2011 index == IWL_RATE_MCS_9_INDEX;
2012
2013 WARN_ON_ONCE(1);
2014 return false;
2015 }
2016
2017 enum tpc_action {
2018 TPC_ACTION_STAY,
2019 TPC_ACTION_DECREASE,
2020 TPC_ACTION_INCREASE,
2021 TPC_ACTION_NO_RESTIRCTION,
2022 };
2023
2024 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2025 s32 sr, int weak, int strong,
2026 int current_tpt,
2027 int weak_tpt, int strong_tpt)
2028 {
2029 /* stay until we have valid tpt */
2030 if (current_tpt == IWL_INVALID_VALUE) {
2031 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2032 return TPC_ACTION_STAY;
2033 }
2034
2035 /* Too many failures, increase txp */
2036 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2037 current_tpt == 0) {
2038 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2039 return TPC_ACTION_NO_RESTIRCTION;
2040 }
2041
2042 /* try decreasing first if applicable */
2043 if (weak != TPC_INVALID) {
2044 if (weak_tpt == IWL_INVALID_VALUE &&
2045 (strong_tpt == IWL_INVALID_VALUE ||
2046 current_tpt >= strong_tpt)) {
2047 IWL_DEBUG_RATE(mvm,
2048 "no weak txp measurement. decrease txp\n");
2049 return TPC_ACTION_DECREASE;
2050 }
2051
2052 if (weak_tpt > current_tpt) {
2053 IWL_DEBUG_RATE(mvm,
2054 "lower txp has better tpt. decrease txp\n");
2055 return TPC_ACTION_DECREASE;
2056 }
2057 }
2058
2059 /* next, increase if needed */
2060 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2061 strong != TPC_INVALID) {
2062 if (weak_tpt == IWL_INVALID_VALUE &&
2063 strong_tpt != IWL_INVALID_VALUE &&
2064 current_tpt < strong_tpt) {
2065 IWL_DEBUG_RATE(mvm,
2066 "higher txp has better tpt. increase txp\n");
2067 return TPC_ACTION_INCREASE;
2068 }
2069
2070 if (weak_tpt < current_tpt &&
2071 (strong_tpt == IWL_INVALID_VALUE ||
2072 strong_tpt > current_tpt)) {
2073 IWL_DEBUG_RATE(mvm,
2074 "lower txp has worse tpt. increase txp\n");
2075 return TPC_ACTION_INCREASE;
2076 }
2077 }
2078
2079 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2080 return TPC_ACTION_STAY;
2081 }
2082
2083 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2084 struct ieee80211_sta *sta,
2085 struct iwl_lq_sta *lq_sta,
2086 struct iwl_scale_tbl_info *tbl)
2087 {
2088 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2089 struct ieee80211_vif *vif = mvm_sta->vif;
2090 struct ieee80211_chanctx_conf *chanctx_conf;
2091 enum ieee80211_band band;
2092 struct iwl_rate_scale_data *window;
2093 struct rs_rate *rate = &tbl->rate;
2094 enum tpc_action action;
2095 s32 sr;
2096 u8 cur = lq_sta->lq.reduced_tpc;
2097 int current_tpt;
2098 int weak, strong;
2099 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2100
2101 #ifdef CONFIG_MAC80211_DEBUGFS
2102 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2103 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2104 lq_sta->pers.dbg_fixed_txp_reduction);
2105 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2106 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2107 }
2108 #endif
2109
2110 rcu_read_lock();
2111 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2112 if (WARN_ON(!chanctx_conf))
2113 band = IEEE80211_NUM_BANDS;
2114 else
2115 band = chanctx_conf->def.chan->band;
2116 rcu_read_unlock();
2117
2118 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2119 IWL_DEBUG_RATE(mvm,
2120 "tpc is not allowed. remove txp restrictions\n");
2121 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2122 return cur != TPC_NO_REDUCTION;
2123 }
2124
2125 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2126
2127 /* Collect measured throughputs for current and adjacent rates */
2128 window = tbl->tpc_win;
2129 sr = window[cur].success_ratio;
2130 current_tpt = window[cur].average_tpt;
2131 if (weak != TPC_INVALID)
2132 weak_tpt = window[weak].average_tpt;
2133 if (strong != TPC_INVALID)
2134 strong_tpt = window[strong].average_tpt;
2135
2136 IWL_DEBUG_RATE(mvm,
2137 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2138 cur, current_tpt, sr, weak, strong,
2139 weak_tpt, strong_tpt);
2140
2141 action = rs_get_tpc_action(mvm, sr, weak, strong,
2142 current_tpt, weak_tpt, strong_tpt);
2143
2144 /* override actions if we are on the edge */
2145 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2146 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2147 action = TPC_ACTION_STAY;
2148 } else if (strong == TPC_INVALID &&
2149 (action == TPC_ACTION_INCREASE ||
2150 action == TPC_ACTION_NO_RESTIRCTION)) {
2151 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2152 action = TPC_ACTION_STAY;
2153 }
2154
2155 switch (action) {
2156 case TPC_ACTION_DECREASE:
2157 lq_sta->lq.reduced_tpc = weak;
2158 return true;
2159 case TPC_ACTION_INCREASE:
2160 lq_sta->lq.reduced_tpc = strong;
2161 return true;
2162 case TPC_ACTION_NO_RESTIRCTION:
2163 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2164 return true;
2165 case TPC_ACTION_STAY:
2166 /* do nothing */
2167 break;
2168 }
2169 return false;
2170 }
2171
2172 /*
2173 * Do rate scaling and search for new modulation mode.
2174 */
2175 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2176 struct ieee80211_sta *sta,
2177 struct iwl_lq_sta *lq_sta,
2178 int tid)
2179 {
2180 int low = IWL_RATE_INVALID;
2181 int high = IWL_RATE_INVALID;
2182 int index;
2183 struct iwl_rate_scale_data *window = NULL;
2184 int current_tpt = IWL_INVALID_VALUE;
2185 int low_tpt = IWL_INVALID_VALUE;
2186 int high_tpt = IWL_INVALID_VALUE;
2187 u32 fail_count;
2188 enum rs_action scale_action = RS_ACTION_STAY;
2189 u16 rate_mask;
2190 u8 update_lq = 0;
2191 struct iwl_scale_tbl_info *tbl, *tbl1;
2192 u8 active_tbl = 0;
2193 u8 done_search = 0;
2194 u16 high_low;
2195 s32 sr;
2196 u8 prev_agg = lq_sta->is_agg;
2197 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2198 struct iwl_mvm_tid_data *tid_data;
2199 struct rs_rate *rate;
2200
2201 lq_sta->is_agg = !!sta_priv->agg_tids;
2202
2203 /*
2204 * Select rate-scale / modulation-mode table to work with in
2205 * the rest of this function: "search" if searching for better
2206 * modulation mode, or "active" if doing rate scaling within a mode.
2207 */
2208 if (!lq_sta->search_better_tbl)
2209 active_tbl = lq_sta->active_tbl;
2210 else
2211 active_tbl = 1 - lq_sta->active_tbl;
2212
2213 tbl = &(lq_sta->lq_info[active_tbl]);
2214 rate = &tbl->rate;
2215
2216 if (prev_agg != lq_sta->is_agg) {
2217 IWL_DEBUG_RATE(mvm,
2218 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2219 prev_agg, lq_sta->is_agg);
2220 rs_set_expected_tpt_table(lq_sta, tbl);
2221 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2222 }
2223
2224 /* current tx rate */
2225 index = rate->index;
2226
2227 /* rates available for this association, and for modulation mode */
2228 rate_mask = rs_get_supported_rates(lq_sta, rate);
2229
2230 if (!(BIT(index) & rate_mask)) {
2231 IWL_ERR(mvm, "Current Rate is not valid\n");
2232 if (lq_sta->search_better_tbl) {
2233 /* revert to active table if search table is not valid*/
2234 rate->type = LQ_NONE;
2235 lq_sta->search_better_tbl = 0;
2236 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2237 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2238 }
2239 return;
2240 }
2241
2242 /* Get expected throughput table and history window for current rate */
2243 if (!tbl->expected_tpt) {
2244 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2245 return;
2246 }
2247
2248 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2249 window = &(tbl->win[index]);
2250
2251 /*
2252 * If there is not enough history to calculate actual average
2253 * throughput, keep analyzing results of more tx frames, without
2254 * changing rate or mode (bypass most of the rest of this function).
2255 * Set up new rate table in uCode only if old rate is not supported
2256 * in current association (use new rate found above).
2257 */
2258 fail_count = window->counter - window->success_counter;
2259 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2260 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2261 IWL_DEBUG_RATE(mvm,
2262 "%s: Test Window: succ %d total %d\n",
2263 rs_pretty_rate(rate),
2264 window->success_counter, window->counter);
2265
2266 /* Can't calculate this yet; not enough history */
2267 window->average_tpt = IWL_INVALID_VALUE;
2268
2269 /* Should we stay with this modulation mode,
2270 * or search for a new one? */
2271 rs_stay_in_table(lq_sta, false);
2272
2273 return;
2274 }
2275
2276 /* If we are searching for better modulation mode, check success. */
2277 if (lq_sta->search_better_tbl) {
2278 /* If good success, continue using the "search" mode;
2279 * no need to send new link quality command, since we're
2280 * continuing to use the setup that we've been trying. */
2281 if (window->average_tpt > lq_sta->last_tpt) {
2282 IWL_DEBUG_RATE(mvm,
2283 "SWITCHING TO NEW TABLE SR: %d "
2284 "cur-tpt %d old-tpt %d\n",
2285 window->success_ratio,
2286 window->average_tpt,
2287 lq_sta->last_tpt);
2288
2289 /* Swap tables; "search" becomes "active" */
2290 lq_sta->active_tbl = active_tbl;
2291 current_tpt = window->average_tpt;
2292 /* Else poor success; go back to mode in "active" table */
2293 } else {
2294 IWL_DEBUG_RATE(mvm,
2295 "GOING BACK TO THE OLD TABLE: SR %d "
2296 "cur-tpt %d old-tpt %d\n",
2297 window->success_ratio,
2298 window->average_tpt,
2299 lq_sta->last_tpt);
2300
2301 /* Nullify "search" table */
2302 rate->type = LQ_NONE;
2303
2304 /* Revert to "active" table */
2305 active_tbl = lq_sta->active_tbl;
2306 tbl = &(lq_sta->lq_info[active_tbl]);
2307
2308 /* Revert to "active" rate and throughput info */
2309 index = tbl->rate.index;
2310 current_tpt = lq_sta->last_tpt;
2311
2312 /* Need to set up a new rate table in uCode */
2313 update_lq = 1;
2314 }
2315
2316 /* Either way, we've made a decision; modulation mode
2317 * search is done, allow rate adjustment next time. */
2318 lq_sta->search_better_tbl = 0;
2319 done_search = 1; /* Don't switch modes below! */
2320 goto lq_update;
2321 }
2322
2323 /* (Else) not in search of better modulation mode, try for better
2324 * starting rate, while staying in this mode. */
2325 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2326 low = high_low & 0xff;
2327 high = (high_low >> 8) & 0xff;
2328
2329 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2330
2331 sr = window->success_ratio;
2332
2333 /* Collect measured throughputs for current and adjacent rates */
2334 current_tpt = window->average_tpt;
2335 if (low != IWL_RATE_INVALID)
2336 low_tpt = tbl->win[low].average_tpt;
2337 if (high != IWL_RATE_INVALID)
2338 high_tpt = tbl->win[high].average_tpt;
2339
2340 IWL_DEBUG_RATE(mvm,
2341 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2342 rs_pretty_rate(rate), current_tpt, sr,
2343 low, high, low_tpt, high_tpt);
2344
2345 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2346 current_tpt, low_tpt, high_tpt);
2347
2348 /* Force a search in case BT doesn't like us being in MIMO */
2349 if (is_mimo(rate) &&
2350 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2351 IWL_DEBUG_RATE(mvm,
2352 "BT Coex forbids MIMO. Search for new config\n");
2353 rs_stay_in_table(lq_sta, true);
2354 goto lq_update;
2355 }
2356
2357 switch (scale_action) {
2358 case RS_ACTION_DOWNSCALE:
2359 /* Decrease starting rate, update uCode's rate table */
2360 if (low != IWL_RATE_INVALID) {
2361 update_lq = 1;
2362 index = low;
2363 } else {
2364 IWL_DEBUG_RATE(mvm,
2365 "At the bottom rate. Can't decrease\n");
2366 }
2367
2368 break;
2369 case RS_ACTION_UPSCALE:
2370 /* Increase starting rate, update uCode's rate table */
2371 if (high != IWL_RATE_INVALID) {
2372 update_lq = 1;
2373 index = high;
2374 } else {
2375 IWL_DEBUG_RATE(mvm,
2376 "At the top rate. Can't increase\n");
2377 }
2378
2379 break;
2380 case RS_ACTION_STAY:
2381 /* No change */
2382 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2383 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2384 break;
2385 default:
2386 break;
2387 }
2388
2389 lq_update:
2390 /* Replace uCode's rate table for the destination station. */
2391 if (update_lq) {
2392 tbl->rate.index = index;
2393 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2394 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2395 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2396 }
2397
2398 rs_stay_in_table(lq_sta, false);
2399
2400 /*
2401 * Search for new modulation mode if we're:
2402 * 1) Not changing rates right now
2403 * 2) Not just finishing up a search
2404 * 3) Allowing a new search
2405 */
2406 if (!update_lq && !done_search &&
2407 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2408 && window->counter) {
2409 enum rs_column next_column;
2410
2411 /* Save current throughput to compare with "search" throughput*/
2412 lq_sta->last_tpt = current_tpt;
2413
2414 IWL_DEBUG_RATE(mvm,
2415 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2416 update_lq, done_search, lq_sta->rs_state,
2417 window->counter);
2418
2419 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2420 if (next_column != RS_COLUMN_INVALID) {
2421 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2422 next_column);
2423 if (!ret)
2424 lq_sta->search_better_tbl = 1;
2425 } else {
2426 IWL_DEBUG_RATE(mvm,
2427 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2428 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2429 }
2430
2431 /* If new "search" mode was selected, set up in uCode table */
2432 if (lq_sta->search_better_tbl) {
2433 /* Access the "search" table, clear its history. */
2434 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2435 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2436
2437 /* Use new "search" start rate */
2438 index = tbl->rate.index;
2439
2440 rs_dump_rate(mvm, &tbl->rate,
2441 "Switch to SEARCH TABLE:");
2442 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2443 } else {
2444 done_search = 1;
2445 }
2446 }
2447
2448 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2449 /* If the "active" (non-search) mode was legacy,
2450 * and we've tried switching antennas,
2451 * but we haven't been able to try HT modes (not available),
2452 * stay with best antenna legacy modulation for a while
2453 * before next round of mode comparisons. */
2454 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2455 if (is_legacy(&tbl1->rate)) {
2456 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2457
2458 if (tid != IWL_MAX_TID_COUNT) {
2459 tid_data = &sta_priv->tid_data[tid];
2460 if (tid_data->state != IWL_AGG_OFF) {
2461 IWL_DEBUG_RATE(mvm,
2462 "Stop aggregation on tid %d\n",
2463 tid);
2464 ieee80211_stop_tx_ba_session(sta, tid);
2465 }
2466 }
2467 rs_set_stay_in_table(mvm, 1, lq_sta);
2468 } else {
2469 /* If we're in an HT mode, and all 3 mode switch actions
2470 * have been tried and compared, stay in this best modulation
2471 * mode for a while before next round of mode comparisons. */
2472 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2473 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2474 (tid != IWL_MAX_TID_COUNT)) {
2475 tid_data = &sta_priv->tid_data[tid];
2476 if (tid_data->state == IWL_AGG_OFF) {
2477 IWL_DEBUG_RATE(mvm,
2478 "try to aggregate tid %d\n",
2479 tid);
2480 rs_tl_turn_on_agg(mvm, tid,
2481 lq_sta, sta);
2482 }
2483 }
2484 rs_set_stay_in_table(mvm, 0, lq_sta);
2485 }
2486 }
2487 }
2488
2489 struct rs_init_rate_info {
2490 s8 rssi;
2491 u8 rate_idx;
2492 };
2493
2494 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2495 { -60, IWL_RATE_54M_INDEX },
2496 { -64, IWL_RATE_48M_INDEX },
2497 { -68, IWL_RATE_36M_INDEX },
2498 { -80, IWL_RATE_24M_INDEX },
2499 { -84, IWL_RATE_18M_INDEX },
2500 { -85, IWL_RATE_12M_INDEX },
2501 { -86, IWL_RATE_11M_INDEX },
2502 { -88, IWL_RATE_5M_INDEX },
2503 { -90, IWL_RATE_2M_INDEX },
2504 { S8_MIN, IWL_RATE_1M_INDEX },
2505 };
2506
2507 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2508 { -60, IWL_RATE_54M_INDEX },
2509 { -64, IWL_RATE_48M_INDEX },
2510 { -72, IWL_RATE_36M_INDEX },
2511 { -80, IWL_RATE_24M_INDEX },
2512 { -84, IWL_RATE_18M_INDEX },
2513 { -85, IWL_RATE_12M_INDEX },
2514 { -87, IWL_RATE_9M_INDEX },
2515 { S8_MIN, IWL_RATE_6M_INDEX },
2516 };
2517
2518 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2519 { -60, IWL_RATE_MCS_7_INDEX },
2520 { -64, IWL_RATE_MCS_6_INDEX },
2521 { -68, IWL_RATE_MCS_5_INDEX },
2522 { -72, IWL_RATE_MCS_4_INDEX },
2523 { -80, IWL_RATE_MCS_3_INDEX },
2524 { -84, IWL_RATE_MCS_2_INDEX },
2525 { -85, IWL_RATE_MCS_1_INDEX },
2526 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2527 };
2528
2529 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2530 { -60, IWL_RATE_MCS_8_INDEX },
2531 { -64, IWL_RATE_MCS_7_INDEX },
2532 { -68, IWL_RATE_MCS_6_INDEX },
2533 { -72, IWL_RATE_MCS_5_INDEX },
2534 { -80, IWL_RATE_MCS_4_INDEX },
2535 { -84, IWL_RATE_MCS_3_INDEX },
2536 { -85, IWL_RATE_MCS_2_INDEX },
2537 { -87, IWL_RATE_MCS_1_INDEX },
2538 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2539 };
2540
2541 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2542 { -60, IWL_RATE_MCS_9_INDEX },
2543 { -64, IWL_RATE_MCS_8_INDEX },
2544 { -68, IWL_RATE_MCS_7_INDEX },
2545 { -72, IWL_RATE_MCS_6_INDEX },
2546 { -80, IWL_RATE_MCS_5_INDEX },
2547 { -84, IWL_RATE_MCS_4_INDEX },
2548 { -85, IWL_RATE_MCS_3_INDEX },
2549 { -87, IWL_RATE_MCS_2_INDEX },
2550 { -88, IWL_RATE_MCS_1_INDEX },
2551 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2552 };
2553
2554 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2555
2556 /* Init the optimal rate based on STA caps
2557 * This combined with rssi is used to report the last tx rate
2558 * to userspace when we haven't transmitted enough frames.
2559 */
2560 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2561 struct ieee80211_sta *sta,
2562 struct iwl_lq_sta *lq_sta)
2563 {
2564 struct rs_rate *rate = &lq_sta->optimal_rate;
2565
2566 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2567 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2568 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2569 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2570 else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2571 rate->type = LQ_LEGACY_A;
2572 else
2573 rate->type = LQ_LEGACY_G;
2574
2575 rate->bw = rs_bw_from_sta_bw(sta);
2576 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2577
2578 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2579
2580 if (is_mimo(rate)) {
2581 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2582 } else if (is_siso(rate)) {
2583 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2584 } else {
2585 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2586
2587 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2588 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2589 lq_sta->optimal_nentries =
2590 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2591 } else {
2592 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2593 lq_sta->optimal_nentries =
2594 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2595 }
2596 }
2597
2598 if (is_vht(rate)) {
2599 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2600 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2601 lq_sta->optimal_nentries =
2602 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2603 } else {
2604 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2605 lq_sta->optimal_nentries =
2606 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2607 }
2608 } else if (is_ht(rate)) {
2609 lq_sta->optimal_rates = rs_optimal_rates_ht;
2610 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2611 }
2612 }
2613
2614 /* Compute the optimal rate index based on RSSI */
2615 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2616 struct iwl_lq_sta *lq_sta)
2617 {
2618 struct rs_rate *rate = &lq_sta->optimal_rate;
2619 int i;
2620
2621 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2622 BITS_PER_LONG);
2623
2624 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2625 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2626
2627 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2628 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2629 rate->index = rate_idx;
2630 break;
2631 }
2632 }
2633
2634 return rate;
2635 }
2636
2637 /* Choose an initial legacy rate and antenna to use based on the RSSI
2638 * of last Rx
2639 */
2640 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2641 struct ieee80211_sta *sta,
2642 struct iwl_lq_sta *lq_sta,
2643 enum ieee80211_band band,
2644 struct rs_rate *rate)
2645 {
2646 int i, nentries;
2647 unsigned long active_rate;
2648 s8 best_rssi = S8_MIN;
2649 u8 best_ant = ANT_NONE;
2650 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2651 const struct rs_init_rate_info *initial_rates;
2652
2653 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2654 if (!(lq_sta->pers.chains & BIT(i)))
2655 continue;
2656
2657 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2658 best_rssi = lq_sta->pers.chain_signal[i];
2659 best_ant = BIT(i);
2660 }
2661 }
2662
2663 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2664 rs_pretty_ant(best_ant), best_rssi);
2665
2666 if (best_ant != ANT_A && best_ant != ANT_B)
2667 rate->ant = first_antenna(valid_tx_ant);
2668 else
2669 rate->ant = best_ant;
2670
2671 rate->sgi = false;
2672 rate->ldpc = false;
2673 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2674
2675 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2676 BITS_PER_LONG);
2677
2678 if (band == IEEE80211_BAND_5GHZ) {
2679 rate->type = LQ_LEGACY_A;
2680 initial_rates = rs_optimal_rates_5ghz_legacy;
2681 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2682 } else {
2683 rate->type = LQ_LEGACY_G;
2684 initial_rates = rs_optimal_rates_24ghz_legacy;
2685 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2686 }
2687
2688 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2689 goto out;
2690
2691 /* Start from a higher rate if the corresponding debug capability
2692 * is enabled. The rate is chosen according to AP capabilities.
2693 * In case of VHT/HT when the rssi is low fallback to the case of
2694 * legacy rates.
2695 */
2696 if (sta->vht_cap.vht_supported &&
2697 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2698 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) {
2699 initial_rates = rs_optimal_rates_vht_40_80mhz;
2700 nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2701 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
2702 rate->bw = RATE_MCS_CHAN_WIDTH_80;
2703 else
2704 rate->bw = RATE_MCS_CHAN_WIDTH_40;
2705 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
2706 initial_rates = rs_optimal_rates_vht_20mhz;
2707 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2708 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2709 } else {
2710 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2711 goto out;
2712 }
2713 active_rate = lq_sta->active_siso_rate;
2714 rate->type = LQ_VHT_SISO;
2715 } else if (sta->ht_cap.ht_supported &&
2716 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2717 initial_rates = rs_optimal_rates_ht;
2718 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2719 active_rate = lq_sta->active_siso_rate;
2720 rate->type = LQ_HT_SISO;
2721 } else {
2722 active_rate = lq_sta->active_legacy_rate;
2723 }
2724
2725 for (i = 0; i < nentries; i++) {
2726 int rate_idx = initial_rates[i].rate_idx;
2727
2728 if ((best_rssi >= initial_rates[i].rssi) &&
2729 (BIT(rate_idx) & active_rate)) {
2730 rate->index = rate_idx;
2731 break;
2732 }
2733 }
2734
2735 out:
2736 rs_dump_rate(mvm, rate, "INITIAL");
2737 }
2738
2739 /* Save info about RSSI of last Rx */
2740 void rs_update_last_rssi(struct iwl_mvm *mvm,
2741 struct iwl_lq_sta *lq_sta,
2742 struct ieee80211_rx_status *rx_status)
2743 {
2744 int i;
2745
2746 lq_sta->pers.chains = rx_status->chains;
2747 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2748 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2749 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2750 lq_sta->pers.last_rssi = S8_MIN;
2751
2752 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2753 if (!(lq_sta->pers.chains & BIT(i)))
2754 continue;
2755
2756 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2757 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2758 }
2759 }
2760
2761 /**
2762 * rs_initialize_lq - Initialize a station's hardware rate table
2763 *
2764 * The uCode's station table contains a table of fallback rates
2765 * for automatic fallback during transmission.
2766 *
2767 * NOTE: This sets up a default set of values. These will be replaced later
2768 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2769 * rc80211_simple.
2770 *
2771 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2772 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2773 * which requires station table entry to exist).
2774 */
2775 static void rs_initialize_lq(struct iwl_mvm *mvm,
2776 struct ieee80211_sta *sta,
2777 struct iwl_lq_sta *lq_sta,
2778 enum ieee80211_band band,
2779 bool init)
2780 {
2781 struct iwl_scale_tbl_info *tbl;
2782 struct rs_rate *rate;
2783 u8 active_tbl = 0;
2784
2785 if (!sta || !lq_sta)
2786 return;
2787
2788 if (!lq_sta->search_better_tbl)
2789 active_tbl = lq_sta->active_tbl;
2790 else
2791 active_tbl = 1 - lq_sta->active_tbl;
2792
2793 tbl = &(lq_sta->lq_info[active_tbl]);
2794 rate = &tbl->rate;
2795
2796 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2797 rs_init_optimal_rate(mvm, sta, lq_sta);
2798
2799 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2800 tbl->column = rs_get_column_from_rate(rate);
2801
2802 rs_set_expected_tpt_table(lq_sta, tbl);
2803 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2804 /* TODO restore station should remember the lq cmd */
2805 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2806 }
2807
2808 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2809 struct ieee80211_tx_rate_control *txrc)
2810 {
2811 struct sk_buff *skb = txrc->skb;
2812 struct iwl_op_mode *op_mode __maybe_unused =
2813 (struct iwl_op_mode *)mvm_r;
2814 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2815 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2816 struct iwl_lq_sta *lq_sta = mvm_sta;
2817 struct rs_rate *optimal_rate;
2818 u32 last_ucode_rate;
2819
2820 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2821 /* if vif isn't initialized mvm doesn't know about
2822 * this station, so don't do anything with the it
2823 */
2824 sta = NULL;
2825 mvm_sta = NULL;
2826 }
2827
2828 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2829
2830 /* Treat uninitialized rate scaling data same as non-existing. */
2831 if (lq_sta && !lq_sta->pers.drv) {
2832 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2833 mvm_sta = NULL;
2834 }
2835
2836 /* Send management frames and NO_ACK data using lowest rate. */
2837 if (rate_control_send_low(sta, mvm_sta, txrc))
2838 return;
2839
2840 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2841 info->band, &info->control.rates[0]);
2842 info->control.rates[0].count = 1;
2843
2844 /* Report the optimal rate based on rssi and STA caps if we haven't
2845 * converged yet (too little traffic) or exploring other modulations
2846 */
2847 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2848 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2849 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2850 optimal_rate);
2851 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2852 &txrc->reported_rate);
2853 }
2854 }
2855
2856 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2857 gfp_t gfp)
2858 {
2859 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2860 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2861 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2862 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2863
2864 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2865
2866 lq_sta->pers.drv = mvm;
2867 #ifdef CONFIG_MAC80211_DEBUGFS
2868 lq_sta->pers.dbg_fixed_rate = 0;
2869 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2870 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2871 #endif
2872 lq_sta->pers.chains = 0;
2873 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2874 lq_sta->pers.last_rssi = S8_MIN;
2875
2876 return &sta_priv->lq_sta;
2877 }
2878
2879 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2880 int nss)
2881 {
2882 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2883 (0x3 << (2 * (nss - 1)));
2884 rx_mcs >>= (2 * (nss - 1));
2885
2886 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2887 return IWL_RATE_MCS_7_INDEX;
2888 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2889 return IWL_RATE_MCS_8_INDEX;
2890 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2891 return IWL_RATE_MCS_9_INDEX;
2892
2893 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2894 return -1;
2895 }
2896
2897 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2898 struct ieee80211_sta_vht_cap *vht_cap,
2899 struct iwl_lq_sta *lq_sta)
2900 {
2901 int i;
2902 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2903
2904 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2905 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2906 if (i == IWL_RATE_9M_INDEX)
2907 continue;
2908
2909 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2910 if (i == IWL_RATE_MCS_9_INDEX &&
2911 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2912 continue;
2913
2914 lq_sta->active_siso_rate |= BIT(i);
2915 }
2916 }
2917
2918 if (sta->rx_nss < 2)
2919 return;
2920
2921 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2922 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2923 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2924 if (i == IWL_RATE_9M_INDEX)
2925 continue;
2926
2927 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2928 if (i == IWL_RATE_MCS_9_INDEX &&
2929 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2930 continue;
2931
2932 lq_sta->active_mimo2_rate |= BIT(i);
2933 }
2934 }
2935 }
2936
2937 static void rs_ht_init(struct iwl_mvm *mvm,
2938 struct ieee80211_sta *sta,
2939 struct iwl_lq_sta *lq_sta,
2940 struct ieee80211_sta_ht_cap *ht_cap)
2941 {
2942 /* active_siso_rate mask includes 9 MBits (bit 5),
2943 * and CCK (bits 0-3), supp_rates[] does not;
2944 * shift to convert format, force 9 MBits off.
2945 */
2946 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2947 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2948 lq_sta->active_siso_rate &= ~((u16)0x2);
2949 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2950
2951 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2952 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2953 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2954 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2955
2956 if (mvm->cfg->ht_params->ldpc &&
2957 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2958 lq_sta->ldpc = true;
2959
2960 if (mvm->cfg->ht_params->stbc &&
2961 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2962 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2963 lq_sta->stbc_capable = true;
2964
2965 lq_sta->is_vht = false;
2966 }
2967
2968 static void rs_vht_init(struct iwl_mvm *mvm,
2969 struct ieee80211_sta *sta,
2970 struct iwl_lq_sta *lq_sta,
2971 struct ieee80211_sta_vht_cap *vht_cap)
2972 {
2973 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2974
2975 if (mvm->cfg->ht_params->ldpc &&
2976 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2977 lq_sta->ldpc = true;
2978
2979 if (mvm->cfg->ht_params->stbc &&
2980 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2981 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2982 lq_sta->stbc_capable = true;
2983
2984 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2985 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2986 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2987 lq_sta->bfer_capable = true;
2988
2989 lq_sta->is_vht = true;
2990 }
2991
2992 #ifdef CONFIG_IWLWIFI_DEBUGFS
2993 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2994 {
2995 spin_lock_bh(&mvm->drv_stats_lock);
2996 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2997 spin_unlock_bh(&mvm->drv_stats_lock);
2998 }
2999
3000 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3001 {
3002 u8 nss = 0, mcs = 0;
3003
3004 spin_lock(&mvm->drv_stats_lock);
3005
3006 if (agg)
3007 mvm->drv_rx_stats.agg_frames++;
3008
3009 mvm->drv_rx_stats.success_frames++;
3010
3011 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3012 case RATE_MCS_CHAN_WIDTH_20:
3013 mvm->drv_rx_stats.bw_20_frames++;
3014 break;
3015 case RATE_MCS_CHAN_WIDTH_40:
3016 mvm->drv_rx_stats.bw_40_frames++;
3017 break;
3018 case RATE_MCS_CHAN_WIDTH_80:
3019 mvm->drv_rx_stats.bw_80_frames++;
3020 break;
3021 default:
3022 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3023 }
3024
3025 if (rate & RATE_MCS_HT_MSK) {
3026 mvm->drv_rx_stats.ht_frames++;
3027 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3028 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3029 } else if (rate & RATE_MCS_VHT_MSK) {
3030 mvm->drv_rx_stats.vht_frames++;
3031 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3032 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3033 RATE_VHT_MCS_NSS_POS) + 1;
3034 } else {
3035 mvm->drv_rx_stats.legacy_frames++;
3036 }
3037
3038 if (nss == 1)
3039 mvm->drv_rx_stats.siso_frames++;
3040 else if (nss == 2)
3041 mvm->drv_rx_stats.mimo2_frames++;
3042
3043 if (rate & RATE_MCS_SGI_MSK)
3044 mvm->drv_rx_stats.sgi_frames++;
3045 else
3046 mvm->drv_rx_stats.ngi_frames++;
3047
3048 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3049 mvm->drv_rx_stats.last_frame_idx =
3050 (mvm->drv_rx_stats.last_frame_idx + 1) %
3051 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3052
3053 spin_unlock(&mvm->drv_stats_lock);
3054 }
3055 #endif
3056
3057 /*
3058 * Called after adding a new station to initialize rate scaling
3059 */
3060 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3061 enum ieee80211_band band, bool init)
3062 {
3063 int i, j;
3064 struct ieee80211_hw *hw = mvm->hw;
3065 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3066 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3067 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3068 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3069 struct ieee80211_supported_band *sband;
3070 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3071
3072 /* clear all non-persistent lq data */
3073 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3074
3075 sband = hw->wiphy->bands[band];
3076
3077 lq_sta->lq.sta_id = sta_priv->sta_id;
3078
3079 for (j = 0; j < LQ_SIZE; j++)
3080 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3081
3082 lq_sta->flush_timer = 0;
3083 lq_sta->last_tx = jiffies;
3084
3085 IWL_DEBUG_RATE(mvm,
3086 "LQ: *** rate scale station global init for station %d ***\n",
3087 sta_priv->sta_id);
3088 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3089 * the lowest or the highest rate.. Could consider using RSSI from
3090 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3091 * after assoc.. */
3092
3093 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3094 lq_sta->band = sband->band;
3095 /*
3096 * active legacy rates as per supported rates bitmap
3097 */
3098 supp = sta->supp_rates[sband->band];
3099 lq_sta->active_legacy_rate = 0;
3100 for_each_set_bit(i, &supp, BITS_PER_LONG)
3101 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3102
3103 /* TODO: should probably account for rx_highest for both HT/VHT */
3104 if (!vht_cap || !vht_cap->vht_supported)
3105 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3106 else
3107 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3108
3109 lq_sta->max_legacy_rate_idx =
3110 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3111 lq_sta->max_siso_rate_idx =
3112 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3113 lq_sta->max_mimo2_rate_idx =
3114 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3115
3116 IWL_DEBUG_RATE(mvm,
3117 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3118 lq_sta->active_legacy_rate,
3119 lq_sta->active_siso_rate,
3120 lq_sta->active_mimo2_rate,
3121 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3122 lq_sta->bfer_capable);
3123 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3124 lq_sta->max_legacy_rate_idx,
3125 lq_sta->max_siso_rate_idx,
3126 lq_sta->max_mimo2_rate_idx);
3127
3128 /* These values will be overridden later */
3129 lq_sta->lq.single_stream_ant_msk =
3130 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3131 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3132
3133 /* as default allow aggregation for all tids */
3134 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3135 lq_sta->is_agg = 0;
3136 #ifdef CONFIG_IWLWIFI_DEBUGFS
3137 iwl_mvm_reset_frame_stats(mvm);
3138 #endif
3139 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3140 }
3141
3142 static void rs_rate_update(void *mvm_r,
3143 struct ieee80211_supported_band *sband,
3144 struct cfg80211_chan_def *chandef,
3145 struct ieee80211_sta *sta, void *priv_sta,
3146 u32 changed)
3147 {
3148 u8 tid;
3149 struct iwl_op_mode *op_mode =
3150 (struct iwl_op_mode *)mvm_r;
3151 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3152
3153 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3154 return;
3155
3156 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3157 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3158 ieee80211_stop_tx_ba_session(sta, tid);
3159
3160 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3161 }
3162
3163 #ifdef CONFIG_MAC80211_DEBUGFS
3164 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3165 struct iwl_lq_cmd *lq_cmd,
3166 enum ieee80211_band band,
3167 u32 ucode_rate)
3168 {
3169 struct rs_rate rate;
3170 int i;
3171 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3172 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3173 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3174
3175 for (i = 0; i < num_rates; i++)
3176 lq_cmd->rs_table[i] = ucode_rate_le32;
3177
3178 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3179
3180 if (is_mimo(&rate))
3181 lq_cmd->mimo_delim = num_rates - 1;
3182 else
3183 lq_cmd->mimo_delim = 0;
3184
3185 lq_cmd->reduced_tpc = 0;
3186
3187 if (num_of_ant(ant) == 1)
3188 lq_cmd->single_stream_ant_msk = ant;
3189
3190 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3191 }
3192 #endif /* CONFIG_MAC80211_DEBUGFS */
3193
3194 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3195 struct iwl_lq_sta *lq_sta,
3196 struct rs_rate *rate,
3197 __le32 *rs_table, int *rs_table_index,
3198 int num_rates, int num_retries,
3199 u8 valid_tx_ant, bool toggle_ant)
3200 {
3201 int i, j;
3202 __le32 ucode_rate;
3203 bool bottom_reached = false;
3204 int prev_rate_idx = rate->index;
3205 int end = LINK_QUAL_MAX_RETRY_NUM;
3206 int index = *rs_table_index;
3207
3208 for (i = 0; i < num_rates && index < end; i++) {
3209 for (j = 0; j < num_retries && index < end; j++, index++) {
3210 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3211 rate));
3212 rs_table[index] = ucode_rate;
3213 if (toggle_ant)
3214 rs_toggle_antenna(valid_tx_ant, rate);
3215 }
3216
3217 prev_rate_idx = rate->index;
3218 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3219 if (bottom_reached && !is_legacy(rate))
3220 break;
3221 }
3222
3223 if (!bottom_reached && !is_legacy(rate))
3224 rate->index = prev_rate_idx;
3225
3226 *rs_table_index = index;
3227 }
3228
3229 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3230 * column the rate table should look like this:
3231 *
3232 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3233 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3234 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3235 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3236 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3237 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3238 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3239 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3240 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3241 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3242 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3243 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3244 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3245 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3246 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3247 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3248 */
3249 static void rs_build_rates_table(struct iwl_mvm *mvm,
3250 struct ieee80211_sta *sta,
3251 struct iwl_lq_sta *lq_sta,
3252 const struct rs_rate *initial_rate)
3253 {
3254 struct rs_rate rate;
3255 int num_rates, num_retries, index = 0;
3256 u8 valid_tx_ant = 0;
3257 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3258 bool toggle_ant = false;
3259
3260 memcpy(&rate, initial_rate, sizeof(rate));
3261
3262 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3263
3264 /* TODO: remove old API when min FW API hits 14 */
3265 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3266 rs_stbc_allow(mvm, sta, lq_sta))
3267 rate.stbc = true;
3268
3269 if (is_siso(&rate)) {
3270 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3271 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3272 } else if (is_mimo(&rate)) {
3273 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3274 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3275 } else {
3276 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3277 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3278 toggle_ant = true;
3279 }
3280
3281 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3282 num_rates, num_retries, valid_tx_ant,
3283 toggle_ant);
3284
3285 rs_get_lower_rate_down_column(lq_sta, &rate);
3286
3287 if (is_siso(&rate)) {
3288 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3289 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3290 lq_cmd->mimo_delim = index;
3291 } else if (is_legacy(&rate)) {
3292 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3293 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3294 } else {
3295 WARN_ON_ONCE(1);
3296 }
3297
3298 toggle_ant = true;
3299
3300 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3301 num_rates, num_retries, valid_tx_ant,
3302 toggle_ant);
3303
3304 rs_get_lower_rate_down_column(lq_sta, &rate);
3305
3306 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3307 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3308
3309 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3310 num_rates, num_retries, valid_tx_ant,
3311 toggle_ant);
3312
3313 }
3314
3315 struct rs_bfer_active_iter_data {
3316 struct ieee80211_sta *exclude_sta;
3317 struct iwl_mvm_sta *bfer_mvmsta;
3318 };
3319
3320 static void rs_bfer_active_iter(void *_data,
3321 struct ieee80211_sta *sta)
3322 {
3323 struct rs_bfer_active_iter_data *data = _data;
3324 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3325 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3326 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3327
3328 if (sta == data->exclude_sta)
3329 return;
3330
3331 /* The current sta has BFER allowed */
3332 if (ss_params & LQ_SS_BFER_ALLOWED) {
3333 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3334
3335 data->bfer_mvmsta = mvmsta;
3336 }
3337 }
3338
3339 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3340 {
3341 int prio = -1;
3342 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3343
3344 switch (viftype) {
3345 case NL80211_IFTYPE_AP:
3346 case NL80211_IFTYPE_P2P_GO:
3347 prio = 3;
3348 break;
3349 case NL80211_IFTYPE_P2P_CLIENT:
3350 prio = 2;
3351 break;
3352 case NL80211_IFTYPE_STATION:
3353 prio = 1;
3354 break;
3355 default:
3356 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3357 prio = -1;
3358 }
3359
3360 return prio;
3361 }
3362
3363 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3364 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3365 struct iwl_mvm_sta *sta2)
3366 {
3367 int prio1 = rs_bfer_priority(sta1);
3368 int prio2 = rs_bfer_priority(sta2);
3369
3370 if (prio1 > prio2)
3371 return 1;
3372 if (prio1 < prio2)
3373 return -1;
3374 return 0;
3375 }
3376
3377 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3378 struct ieee80211_sta *sta,
3379 struct iwl_lq_sta *lq_sta,
3380 const struct rs_rate *initial_rate)
3381 {
3382 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3383 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3384 struct rs_bfer_active_iter_data data = {
3385 .exclude_sta = sta,
3386 .bfer_mvmsta = NULL,
3387 };
3388 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3389 u32 ss_params = LQ_SS_PARAMS_VALID;
3390
3391 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3392 goto out;
3393
3394 #ifdef CONFIG_MAC80211_DEBUGFS
3395 /* Check if forcing the decision is configured.
3396 * Note that SISO is forced by not allowing STBC or BFER
3397 */
3398 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3399 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3400 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3401 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3402
3403 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3404 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3405 lq_sta->pers.ss_force);
3406 goto out;
3407 }
3408 #endif
3409
3410 if (lq_sta->stbc_capable)
3411 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3412
3413 if (!lq_sta->bfer_capable)
3414 goto out;
3415
3416 ieee80211_iterate_stations_atomic(mvm->hw,
3417 rs_bfer_active_iter,
3418 &data);
3419 bfer_mvmsta = data.bfer_mvmsta;
3420
3421 /* This code is safe as it doesn't run concurrently for different
3422 * stations. This is guaranteed by the fact that calls to
3423 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3424 */
3425 if (!bfer_mvmsta) {
3426 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3427
3428 ss_params |= LQ_SS_BFER_ALLOWED;
3429 goto out;
3430 }
3431
3432 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3433 bfer_mvmsta->sta_id);
3434
3435 /* Disallow BFER on another STA if active and we're a higher priority */
3436 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3437 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3438 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3439
3440 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3441 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3442 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3443
3444 ss_params |= LQ_SS_BFER_ALLOWED;
3445 IWL_DEBUG_RATE(mvm,
3446 "Lower priority BFER sta found (%d). Switch BFER\n",
3447 bfer_mvmsta->sta_id);
3448 }
3449 out:
3450 lq_cmd->ss_params = cpu_to_le32(ss_params);
3451 }
3452
3453 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3454 struct ieee80211_sta *sta,
3455 struct iwl_lq_sta *lq_sta,
3456 const struct rs_rate *initial_rate)
3457 {
3458 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3459 struct iwl_mvm_sta *mvmsta;
3460 struct iwl_mvm_vif *mvmvif;
3461
3462 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3463 lq_cmd->agg_time_limit =
3464 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3465
3466 #ifdef CONFIG_MAC80211_DEBUGFS
3467 if (lq_sta->pers.dbg_fixed_rate) {
3468 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3469 lq_sta->band,
3470 lq_sta->pers.dbg_fixed_rate);
3471 return;
3472 }
3473 #endif
3474 if (WARN_ON_ONCE(!sta || !initial_rate))
3475 return;
3476
3477 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3478
3479 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3480 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3481
3482 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3483 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3484
3485 if (num_of_ant(initial_rate->ant) == 1)
3486 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3487
3488 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3489
3490 /*
3491 * In case of low latency, tell the firmware to leave a frame in the
3492 * Tx Fifo so that it can start a transaction in the same TxOP. This
3493 * basically allows the firmware to send bursts.
3494 */
3495 if (iwl_mvm_vif_low_latency(mvmvif))
3496 lq_cmd->agg_frame_cnt_limit--;
3497
3498 if (mvmsta->vif->p2p)
3499 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3500
3501 lq_cmd->agg_time_limit =
3502 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3503 }
3504
3505 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3506 {
3507 return hw->priv;
3508 }
3509 /* rate scale requires free function to be implemented */
3510 static void rs_free(void *mvm_rate)
3511 {
3512 return;
3513 }
3514
3515 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3516 void *mvm_sta)
3517 {
3518 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3519 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3520
3521 IWL_DEBUG_RATE(mvm, "enter\n");
3522 IWL_DEBUG_RATE(mvm, "leave\n");
3523 }
3524
3525 #ifdef CONFIG_MAC80211_DEBUGFS
3526 int rs_pretty_print_rate(char *buf, const u32 rate)
3527 {
3528
3529 char *type, *bw;
3530 u8 mcs = 0, nss = 0;
3531 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3532
3533 if (!(rate & RATE_MCS_HT_MSK) &&
3534 !(rate & RATE_MCS_VHT_MSK)) {
3535 int index = iwl_hwrate_to_plcp_idx(rate);
3536
3537 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3538 rs_pretty_ant(ant),
3539 index == IWL_RATE_INVALID ? "BAD" :
3540 iwl_rate_mcs[index].mbps);
3541 }
3542
3543 if (rate & RATE_MCS_VHT_MSK) {
3544 type = "VHT";
3545 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3546 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3547 >> RATE_VHT_MCS_NSS_POS) + 1;
3548 } else if (rate & RATE_MCS_HT_MSK) {
3549 type = "HT";
3550 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3551 } else {
3552 type = "Unknown"; /* shouldn't happen */
3553 }
3554
3555 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3556 case RATE_MCS_CHAN_WIDTH_20:
3557 bw = "20Mhz";
3558 break;
3559 case RATE_MCS_CHAN_WIDTH_40:
3560 bw = "40Mhz";
3561 break;
3562 case RATE_MCS_CHAN_WIDTH_80:
3563 bw = "80Mhz";
3564 break;
3565 case RATE_MCS_CHAN_WIDTH_160:
3566 bw = "160Mhz";
3567 break;
3568 default:
3569 bw = "BAD BW";
3570 }
3571
3572 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3573 type, rs_pretty_ant(ant), bw, mcs, nss,
3574 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3575 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3576 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3577 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3578 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3579 }
3580
3581 /**
3582 * Program the device to use fixed rate for frame transmit
3583 * This is for debugging/testing only
3584 * once the device start use fixed rate, we need to reload the module
3585 * to being back the normal operation.
3586 */
3587 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3588 struct iwl_lq_sta *lq_sta)
3589 {
3590 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3591 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3592 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3593
3594 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3595 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3596
3597 if (lq_sta->pers.dbg_fixed_rate) {
3598 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3599 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3600 }
3601 }
3602
3603 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3604 const char __user *user_buf, size_t count, loff_t *ppos)
3605 {
3606 struct iwl_lq_sta *lq_sta = file->private_data;
3607 struct iwl_mvm *mvm;
3608 char buf[64];
3609 size_t buf_size;
3610 u32 parsed_rate;
3611
3612 mvm = lq_sta->pers.drv;
3613 memset(buf, 0, sizeof(buf));
3614 buf_size = min(count, sizeof(buf) - 1);
3615 if (copy_from_user(buf, user_buf, buf_size))
3616 return -EFAULT;
3617
3618 if (sscanf(buf, "%x", &parsed_rate) == 1)
3619 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3620 else
3621 lq_sta->pers.dbg_fixed_rate = 0;
3622
3623 rs_program_fix_rate(mvm, lq_sta);
3624
3625 return count;
3626 }
3627
3628 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3629 char __user *user_buf, size_t count, loff_t *ppos)
3630 {
3631 char *buff;
3632 int desc = 0;
3633 int i = 0;
3634 ssize_t ret;
3635
3636 struct iwl_lq_sta *lq_sta = file->private_data;
3637 struct iwl_mvm *mvm;
3638 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3639 struct rs_rate *rate = &tbl->rate;
3640 u32 ss_params;
3641 mvm = lq_sta->pers.drv;
3642 buff = kmalloc(2048, GFP_KERNEL);
3643 if (!buff)
3644 return -ENOMEM;
3645
3646 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3647 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3648 lq_sta->total_failed, lq_sta->total_success,
3649 lq_sta->active_legacy_rate);
3650 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3651 lq_sta->pers.dbg_fixed_rate);
3652 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3653 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3654 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3655 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3656 desc += sprintf(buff+desc, "lq type %s\n",
3657 (is_legacy(rate)) ? "legacy" :
3658 is_vht(rate) ? "VHT" : "HT");
3659 if (!is_legacy(rate)) {
3660 desc += sprintf(buff + desc, " %s",
3661 (is_siso(rate)) ? "SISO" : "MIMO2");
3662 desc += sprintf(buff + desc, " %s",
3663 (is_ht20(rate)) ? "20MHz" :
3664 (is_ht40(rate)) ? "40MHz" :
3665 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3666 desc += sprintf(buff + desc, " %s %s %s\n",
3667 (rate->sgi) ? "SGI" : "NGI",
3668 (rate->ldpc) ? "LDPC" : "BCC",
3669 (lq_sta->is_agg) ? "AGG on" : "");
3670 }
3671 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3672 lq_sta->last_rate_n_flags);
3673 desc += sprintf(buff+desc,
3674 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3675 lq_sta->lq.flags,
3676 lq_sta->lq.mimo_delim,
3677 lq_sta->lq.single_stream_ant_msk,
3678 lq_sta->lq.dual_stream_ant_msk);
3679
3680 desc += sprintf(buff+desc,
3681 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3682 le16_to_cpu(lq_sta->lq.agg_time_limit),
3683 lq_sta->lq.agg_disable_start_th,
3684 lq_sta->lq.agg_frame_cnt_limit);
3685
3686 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3687 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3688 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3689 (ss_params & LQ_SS_PARAMS_VALID) ?
3690 "VALID" : "INVALID",
3691 (ss_params & LQ_SS_BFER_ALLOWED) ?
3692 ", BFER" : "",
3693 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3694 ", STBC" : "",
3695 (ss_params & LQ_SS_FORCE) ?
3696 ", FORCE" : "");
3697 desc += sprintf(buff+desc,
3698 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3699 lq_sta->lq.initial_rate_index[0],
3700 lq_sta->lq.initial_rate_index[1],
3701 lq_sta->lq.initial_rate_index[2],
3702 lq_sta->lq.initial_rate_index[3]);
3703
3704 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3705 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3706
3707 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3708 desc += rs_pretty_print_rate(buff+desc, r);
3709 }
3710
3711 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3712 kfree(buff);
3713 return ret;
3714 }
3715
3716 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3717 .write = rs_sta_dbgfs_scale_table_write,
3718 .read = rs_sta_dbgfs_scale_table_read,
3719 .open = simple_open,
3720 .llseek = default_llseek,
3721 };
3722 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3723 char __user *user_buf, size_t count, loff_t *ppos)
3724 {
3725 char *buff;
3726 int desc = 0;
3727 int i, j;
3728 ssize_t ret;
3729 struct iwl_scale_tbl_info *tbl;
3730 struct rs_rate *rate;
3731 struct iwl_lq_sta *lq_sta = file->private_data;
3732
3733 buff = kmalloc(1024, GFP_KERNEL);
3734 if (!buff)
3735 return -ENOMEM;
3736
3737 for (i = 0; i < LQ_SIZE; i++) {
3738 tbl = &(lq_sta->lq_info[i]);
3739 rate = &tbl->rate;
3740 desc += sprintf(buff+desc,
3741 "%s type=%d SGI=%d BW=%s DUP=0\n"
3742 "index=%d\n",
3743 lq_sta->active_tbl == i ? "*" : "x",
3744 rate->type,
3745 rate->sgi,
3746 is_ht20(rate) ? "20Mhz" :
3747 is_ht40(rate) ? "40Mhz" :
3748 is_ht80(rate) ? "80Mhz" : "ERR",
3749 rate->index);
3750 for (j = 0; j < IWL_RATE_COUNT; j++) {
3751 desc += sprintf(buff+desc,
3752 "counter=%d success=%d %%=%d\n",
3753 tbl->win[j].counter,
3754 tbl->win[j].success_counter,
3755 tbl->win[j].success_ratio);
3756 }
3757 }
3758 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3759 kfree(buff);
3760 return ret;
3761 }
3762
3763 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3764 .read = rs_sta_dbgfs_stats_table_read,
3765 .open = simple_open,
3766 .llseek = default_llseek,
3767 };
3768
3769 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3770 char __user *user_buf,
3771 size_t count, loff_t *ppos)
3772 {
3773 static const char * const column_name[] = {
3774 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3775 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3776 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3777 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3778 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3779 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3780 [RS_COLUMN_MIMO2] = "MIMO2",
3781 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3782 };
3783
3784 static const char * const rate_name[] = {
3785 [IWL_RATE_1M_INDEX] = "1M",
3786 [IWL_RATE_2M_INDEX] = "2M",
3787 [IWL_RATE_5M_INDEX] = "5.5M",
3788 [IWL_RATE_11M_INDEX] = "11M",
3789 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3790 [IWL_RATE_9M_INDEX] = "9M",
3791 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3792 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3793 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3794 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3795 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3796 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3797 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3798 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3799 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3800 };
3801
3802 char *buff, *pos, *endpos;
3803 int col, rate;
3804 ssize_t ret;
3805 struct iwl_lq_sta *lq_sta = file->private_data;
3806 struct rs_rate_stats *stats;
3807 static const size_t bufsz = 1024;
3808
3809 buff = kmalloc(bufsz, GFP_KERNEL);
3810 if (!buff)
3811 return -ENOMEM;
3812
3813 pos = buff;
3814 endpos = pos + bufsz;
3815
3816 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3817 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3818 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3819 pos += scnprintf(pos, endpos - pos, "\n");
3820
3821 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3822 pos += scnprintf(pos, endpos - pos,
3823 "%s,", column_name[col]);
3824
3825 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3826 stats = &(lq_sta->pers.tx_stats[col][rate]);
3827 pos += scnprintf(pos, endpos - pos,
3828 "%llu/%llu,",
3829 stats->success,
3830 stats->total);
3831 }
3832 pos += scnprintf(pos, endpos - pos, "\n");
3833 }
3834
3835 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3836 kfree(buff);
3837 return ret;
3838 }
3839
3840 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3841 const char __user *user_buf,
3842 size_t count, loff_t *ppos)
3843 {
3844 struct iwl_lq_sta *lq_sta = file->private_data;
3845 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3846
3847 return count;
3848 }
3849
3850 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3851 .read = rs_sta_dbgfs_drv_tx_stats_read,
3852 .write = rs_sta_dbgfs_drv_tx_stats_write,
3853 .open = simple_open,
3854 .llseek = default_llseek,
3855 };
3856
3857 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3858 char __user *user_buf,
3859 size_t count, loff_t *ppos)
3860 {
3861 struct iwl_lq_sta *lq_sta = file->private_data;
3862 char buf[12];
3863 int bufsz = sizeof(buf);
3864 int pos = 0;
3865 static const char * const ss_force_name[] = {
3866 [RS_SS_FORCE_NONE] = "none",
3867 [RS_SS_FORCE_STBC] = "stbc",
3868 [RS_SS_FORCE_BFER] = "bfer",
3869 [RS_SS_FORCE_SISO] = "siso",
3870 };
3871
3872 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3873 ss_force_name[lq_sta->pers.ss_force]);
3874 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3875 }
3876
3877 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3878 size_t count, loff_t *ppos)
3879 {
3880 struct iwl_mvm *mvm = lq_sta->pers.drv;
3881 int ret = 0;
3882
3883 if (!strncmp("none", buf, 4)) {
3884 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3885 } else if (!strncmp("siso", buf, 4)) {
3886 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3887 } else if (!strncmp("stbc", buf, 4)) {
3888 if (lq_sta->stbc_capable) {
3889 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3890 } else {
3891 IWL_ERR(mvm,
3892 "can't force STBC. peer doesn't support\n");
3893 ret = -EINVAL;
3894 }
3895 } else if (!strncmp("bfer", buf, 4)) {
3896 if (lq_sta->bfer_capable) {
3897 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3898 } else {
3899 IWL_ERR(mvm,
3900 "can't force BFER. peer doesn't support\n");
3901 ret = -EINVAL;
3902 }
3903 } else {
3904 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3905 ret = -EINVAL;
3906 }
3907 return ret ?: count;
3908 }
3909
3910 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3911 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3912 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3913 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3914 &iwl_dbgfs_##name##_ops)) \
3915 goto err; \
3916 } while (0)
3917
3918 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3919
3920 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3921 {
3922 struct iwl_lq_sta *lq_sta = priv_sta;
3923 struct iwl_mvm_sta *mvmsta;
3924
3925 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3926
3927 if (!mvmsta->vif)
3928 return;
3929
3930 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3931 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3932 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3933 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3934 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3935 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3936 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3937 &lq_sta->tx_agg_tid_en);
3938 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3939 &lq_sta->pers.dbg_fixed_txp_reduction);
3940
3941 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3942 return;
3943 err:
3944 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3945 }
3946
3947 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3948 {
3949 }
3950 #endif
3951
3952 /*
3953 * Initialization of rate scaling information is done by driver after
3954 * the station is added. Since mac80211 calls this function before a
3955 * station is added we ignore it.
3956 */
3957 static void rs_rate_init_stub(void *mvm_r,
3958 struct ieee80211_supported_band *sband,
3959 struct cfg80211_chan_def *chandef,
3960 struct ieee80211_sta *sta, void *mvm_sta)
3961 {
3962 }
3963
3964 static const struct rate_control_ops rs_mvm_ops = {
3965 .name = RS_NAME,
3966 .tx_status = rs_mac80211_tx_status,
3967 .get_rate = rs_get_rate,
3968 .rate_init = rs_rate_init_stub,
3969 .alloc = rs_alloc,
3970 .free = rs_free,
3971 .alloc_sta = rs_alloc_sta,
3972 .free_sta = rs_free_sta,
3973 .rate_update = rs_rate_update,
3974 #ifdef CONFIG_MAC80211_DEBUGFS
3975 .add_sta_debugfs = rs_add_debugfs,
3976 .remove_sta_debugfs = rs_remove_debugfs,
3977 #endif
3978 };
3979
3980 int iwl_mvm_rate_control_register(void)
3981 {
3982 return ieee80211_rate_control_register(&rs_mvm_ops);
3983 }
3984
3985 void iwl_mvm_rate_control_unregister(void)
3986 {
3987 ieee80211_rate_control_unregister(&rs_mvm_ops);
3988 }
3989
3990 /**
3991 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3992 * Tx protection, according to this request and previous requests,
3993 * and send the LQ command.
3994 * @mvmsta: The station
3995 * @enable: Enable Tx protection?
3996 */
3997 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3998 bool enable)
3999 {
4000 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4001
4002 lockdep_assert_held(&mvm->mutex);
4003
4004 if (enable) {
4005 if (mvmsta->tx_protection == 0)
4006 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4007 mvmsta->tx_protection++;
4008 } else {
4009 mvmsta->tx_protection--;
4010 if (mvmsta->tx_protection == 0)
4011 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4012 }
4013
4014 return iwl_mvm_send_lq_cmd(mvm, lq, false);
4015 }
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